<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2022 Workiva-->
<!--r:3e69a77d-9563-4bb1-a234-0a9468d31867,g:9af99fad-e4ab-4675-99de-23b6e4a5c6f1-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.matrixservicecompany.com/role/ConsolidatedStatementsofChangesinStockholdersEquity" xlink:type="simple" xlink:href="mtrx-20220630.xsd#ConsolidatedStatementsofChangesinStockholdersEquity"/>
  <link:definitionLink xlink:role="http://www.matrixservicecompany.com/role/ConsolidatedStatementsofChangesinStockholdersEquity" xlink:type="extended" id="i66c8032707414c3a9cac66e400411e2f_ConsolidatedStatementsofChangesinStockholdersEquity">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_3259bf90-7f55-419b-8bf7-1e4ac5b47c4e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_934f355a-a6cd-4354-b57e-e1abed6670ba" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_3259bf90-7f55-419b-8bf7-1e4ac5b47c4e" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_934f355a-a6cd-4354-b57e-e1abed6670ba" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_538de81a-64a3-41f1-9e72-5cfae5a87ded" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_934f355a-a6cd-4354-b57e-e1abed6670ba" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_538de81a-64a3-41f1-9e72-5cfae5a87ded" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_aad2c29e-3c2c-4b52-bed6-45c0140d0027" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_934f355a-a6cd-4354-b57e-e1abed6670ba" xlink:to="loc_us-gaap_ProfitLoss_aad2c29e-3c2c-4b52-bed6-45c0140d0027" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_db6284de-bc30-49c5-b2ad-00125ad40e52" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_934f355a-a6cd-4354-b57e-e1abed6670ba" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_db6284de-bc30-49c5-b2ad-00125ad40e52" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_a4fcb7cd-e0d4-4107-8f2b-f8134d41a96c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_934f355a-a6cd-4354-b57e-e1abed6670ba" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_a4fcb7cd-e0d4-4107-8f2b-f8134d41a96c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_2a36243b-c51f-4288-868c-e691425ed5c2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_934f355a-a6cd-4354-b57e-e1abed6670ba" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_2a36243b-c51f-4288-868c-e691425ed5c2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_IssuanceOfDeferredShares_ea6309c3-1c44-4a38-acf0-0310b75bb71c" xlink:href="mtrx-20220630.xsd#mtrx_IssuanceOfDeferredShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_934f355a-a6cd-4354-b57e-e1abed6670ba" xlink:to="loc_mtrx_IssuanceOfDeferredShares_ea6309c3-1c44-4a38-acf0-0310b75bb71c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_OtherTreasurySharePurchases_a8962bf9-2d63-40dd-a543-d79d3b774844" xlink:href="mtrx-20220630.xsd#mtrx_OtherTreasurySharePurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_934f355a-a6cd-4354-b57e-e1abed6670ba" xlink:to="loc_mtrx_OtherTreasurySharePurchases_a8962bf9-2d63-40dd-a543-d79d3b774844" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_cb08ef84-56cc-49f6-b6e2-d2f09c3632b8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_934f355a-a6cd-4354-b57e-e1abed6670ba" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_cb08ef84-56cc-49f6-b6e2-d2f09c3632b8" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_448b07c3-b298-4cc0-a4fa-380d68203c3e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_934f355a-a6cd-4354-b57e-e1abed6670ba" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_448b07c3-b298-4cc0-a4fa-380d68203c3e" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_03a06db2-a017-46bd-a67b-0a6685c86a19" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_991b95ab-2a47-44f8-a644-6d28eeaee493" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_3259bf90-7f55-419b-8bf7-1e4ac5b47c4e" xlink:to="loc_us-gaap_StatementTable_991b95ab-2a47-44f8-a644-6d28eeaee493" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_40ddd6ad-b3c6-490d-93b8-2d56300ab42e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_991b95ab-2a47-44f8-a644-6d28eeaee493" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_40ddd6ad-b3c6-490d-93b8-2d56300ab42e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_40ddd6ad-b3c6-490d-93b8-2d56300ab42e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_40ddd6ad-b3c6-490d-93b8-2d56300ab42e" xlink:to="loc_us-gaap_EquityComponentDomain_40ddd6ad-b3c6-490d-93b8-2d56300ab42e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_5d35263c-6a7e-4c9f-a378-78afb9b8613f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_40ddd6ad-b3c6-490d-93b8-2d56300ab42e" xlink:to="loc_us-gaap_EquityComponentDomain_5d35263c-6a7e-4c9f-a378-78afb9b8613f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_e8d4bdb9-553b-43d1-97b2-53401262aa86" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_5d35263c-6a7e-4c9f-a378-78afb9b8613f" xlink:to="loc_us-gaap_CommonStockMember_e8d4bdb9-553b-43d1-97b2-53401262aa86" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_19ca8050-337a-4d49-bed9-fe476de7a350" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_5d35263c-6a7e-4c9f-a378-78afb9b8613f" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_19ca8050-337a-4d49-bed9-fe476de7a350" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_114fc414-32db-412e-b25a-e0206357dc01" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_5d35263c-6a7e-4c9f-a378-78afb9b8613f" xlink:to="loc_us-gaap_RetainedEarningsMember_114fc414-32db-412e-b25a-e0206357dc01" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockMember_e377f76e-2af0-4f1e-a62a-fd7024a95e4d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TreasuryStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_5d35263c-6a7e-4c9f-a378-78afb9b8613f" xlink:to="loc_us-gaap_TreasuryStockMember_e377f76e-2af0-4f1e-a62a-fd7024a95e4d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_f20b9cfe-e816-4e03-a40b-0c2123dcf8f1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_5d35263c-6a7e-4c9f-a378-78afb9b8613f" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_f20b9cfe-e816-4e03-a40b-0c2123dcf8f1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_b80fa2c1-2cdb-4c46-a0dc-16ac2724f6ac" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_5d35263c-6a7e-4c9f-a378-78afb9b8613f" xlink:to="loc_us-gaap_NoncontrollingInterestMember_b80fa2c1-2cdb-4c46-a0dc-16ac2724f6ac" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.matrixservicecompany.com/role/ConsolidatedStatementsofChangesinStockholdersEquityParenthetical" xlink:type="simple" xlink:href="mtrx-20220630.xsd#ConsolidatedStatementsofChangesinStockholdersEquityParenthetical"/>
  <link:definitionLink xlink:role="http://www.matrixservicecompany.com/role/ConsolidatedStatementsofChangesinStockholdersEquityParenthetical" xlink:type="extended" id="ib48bacdc6bd443109eccdbfe8ef0d4a6_ConsolidatedStatementsofChangesinStockholdersEquityParenthetical">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_7a200359-842a-4a0b-a78a-7f1eba06214e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_071462ce-fbee-40e0-8a28-8ed4e8702dbf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7a200359-842a-4a0b-a78a-7f1eba06214e" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_071462ce-fbee-40e0-8a28-8ed4e8702dbf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_b83507aa-ba38-4c83-a2ab-c6501d8dd107" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7a200359-842a-4a0b-a78a-7f1eba06214e" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_b83507aa-ba38-4c83-a2ab-c6501d8dd107" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_DeferredSharesIssued_e43c6fdc-0021-465f-8924-9d31fc7dac95" xlink:href="mtrx-20220630.xsd#mtrx_DeferredSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7a200359-842a-4a0b-a78a-7f1eba06214e" xlink:to="loc_mtrx_DeferredSharesIssued_e43c6fdc-0021-465f-8924-9d31fc7dac95" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_OtherTreasurySharesAcquired_8e6a7c43-b003-4bfc-8073-312d72fa65aa" xlink:href="mtrx-20220630.xsd#mtrx_OtherTreasurySharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7a200359-842a-4a0b-a78a-7f1eba06214e" xlink:to="loc_mtrx_OtherTreasurySharesAcquired_8e6a7c43-b003-4bfc-8073-312d72fa65aa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_bb9c5e26-bd57-45cf-93c6-6d19d5ed5426" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7a200359-842a-4a0b-a78a-7f1eba06214e" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_bb9c5e26-bd57-45cf-93c6-6d19d5ed5426" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_c75248be-3c29-4ed5-b9f9-1b1e1142ccfb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_7a200359-842a-4a0b-a78a-7f1eba06214e" xlink:to="loc_us-gaap_StatementTable_c75248be-3c29-4ed5-b9f9-1b1e1142ccfb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_db433c5b-fd4f-437c-ab53-b3d2a5a34667" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_c75248be-3c29-4ed5-b9f9-1b1e1142ccfb" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_db433c5b-fd4f-437c-ab53-b3d2a5a34667" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_db433c5b-fd4f-437c-ab53-b3d2a5a34667_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_db433c5b-fd4f-437c-ab53-b3d2a5a34667" xlink:to="loc_us-gaap_EquityComponentDomain_db433c5b-fd4f-437c-ab53-b3d2a5a34667_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_27b448ea-79c5-458d-a059-19daf3bc94a3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_db433c5b-fd4f-437c-ab53-b3d2a5a34667" xlink:to="loc_us-gaap_EquityComponentDomain_27b448ea-79c5-458d-a059-19daf3bc94a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_954d6d4d-9294-4e79-9f75-cd951eecd94b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_27b448ea-79c5-458d-a059-19daf3bc94a3" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_954d6d4d-9294-4e79-9f75-cd951eecd94b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_092c1eb2-5e4a-448e-ab0b-e73b80f1d0cd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_27b448ea-79c5-458d-a059-19daf3bc94a3" xlink:to="loc_us-gaap_RetainedEarningsMember_092c1eb2-5e4a-448e-ab0b-e73b80f1d0cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockMember_02df961a-46ac-406e-93c2-ad7bdacdef78" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TreasuryStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_27b448ea-79c5-458d-a059-19daf3bc94a3" xlink:to="loc_us-gaap_TreasuryStockMember_02df961a-46ac-406e-93c2-ad7bdacdef78" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.matrixservicecompany.com/role/SummaryofSignificantAccountingPoliciesDetailsTextual" xlink:type="simple" xlink:href="mtrx-20220630.xsd#SummaryofSignificantAccountingPoliciesDetailsTextual"/>
  <link:definitionLink xlink:role="http://www.matrixservicecompany.com/role/SummaryofSignificantAccountingPoliciesDetailsTextual" xlink:type="extended" id="ied8c204b12fb4113b545deb79ac28615_SummaryofSignificantAccountingPoliciesDetailsTextual">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_eee6a6f2-fa80-4fe9-ba28-d411be7f8b69" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_09eb731e-0d2e-4b83-b29c-6b1aef370ce9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_eee6a6f2-fa80-4fe9-ba28-d411be7f8b69" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_09eb731e-0d2e-4b83-b29c-6b1aef370ce9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_90d3ecba-18cf-44d8-960a-ac3efc08e81c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_eee6a6f2-fa80-4fe9-ba28-d411be7f8b69" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_90d3ecba-18cf-44d8-960a-ac3efc08e81c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_2ef9bbe8-ebe9-4f90-80ef-06ed63b6f762" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_eee6a6f2-fa80-4fe9-ba28-d411be7f8b69" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_2ef9bbe8-ebe9-4f90-80ef-06ed63b6f762" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_37099e7f-dbdc-4fed-a528-fd47bb2bdf7e" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_2ef9bbe8-ebe9-4f90-80ef-06ed63b6f762" xlink:to="loc_srt_StatementGeographicalAxis_37099e7f-dbdc-4fed-a528-fd47bb2bdf7e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_37099e7f-dbdc-4fed-a528-fd47bb2bdf7e_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_37099e7f-dbdc-4fed-a528-fd47bb2bdf7e" xlink:to="loc_srt_SegmentGeographicalDomain_37099e7f-dbdc-4fed-a528-fd47bb2bdf7e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_d88e3b1c-089a-4c6d-b9c2-15609c248b4c" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_37099e7f-dbdc-4fed-a528-fd47bb2bdf7e" xlink:to="loc_srt_SegmentGeographicalDomain_d88e3b1c-089a-4c6d-b9c2-15609c248b4c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_InternationalMember_36262568-748c-42e1-ad2d-a7560ba56900" xlink:href="mtrx-20220630.xsd#mtrx_InternationalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_d88e3b1c-089a-4c6d-b9c2-15609c248b4c" xlink:to="loc_mtrx_InternationalMember_36262568-748c-42e1-ad2d-a7560ba56900" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_257a2fb7-7241-4bf9-81f7-fc3f7dad8ff6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_2ef9bbe8-ebe9-4f90-80ef-06ed63b6f762" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_257a2fb7-7241-4bf9-81f7-fc3f7dad8ff6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_257a2fb7-7241-4bf9-81f7-fc3f7dad8ff6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_257a2fb7-7241-4bf9-81f7-fc3f7dad8ff6" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_257a2fb7-7241-4bf9-81f7-fc3f7dad8ff6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_fded0ae3-60e4-484c-a9e0-8fc750017548" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_257a2fb7-7241-4bf9-81f7-fc3f7dad8ff6" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_fded0ae3-60e4-484c-a9e0-8fc750017548" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingMember_26e11f01-26e4-4943-83a0-2ab1fc2b6982" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BuildingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_fded0ae3-60e4-484c-a9e0-8fc750017548" xlink:to="loc_us-gaap_BuildingMember_26e11f01-26e4-4943-83a0-2ab1fc2b6982" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquipmentMember_d188f22b-b309-43b0-886b-3476c5a79cff" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_fded0ae3-60e4-484c-a9e0-8fc750017548" xlink:to="loc_us-gaap_EquipmentMember_d188f22b-b309-43b0-886b-3476c5a79cff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransportationEquipmentMember_8b9239b3-bb0c-406f-8f6b-270da362ad0e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransportationEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_fded0ae3-60e4-484c-a9e0-8fc750017548" xlink:to="loc_us-gaap_TransportationEquipmentMember_8b9239b3-bb0c-406f-8f6b-270da362ad0e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_474bd193-cc32-4eaa-b2a1-c9e7e21686f4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FurnitureAndFixturesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_fded0ae3-60e4-484c-a9e0-8fc750017548" xlink:to="loc_us-gaap_FurnitureAndFixturesMember_474bd193-cc32-4eaa-b2a1-c9e7e21686f4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_574175f2-bf87-4393-afd4-99b7d967608e" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_2ef9bbe8-ebe9-4f90-80ef-06ed63b6f762" xlink:to="loc_srt_RangeAxis_574175f2-bf87-4393-afd4-99b7d967608e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_574175f2-bf87-4393-afd4-99b7d967608e_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_574175f2-bf87-4393-afd4-99b7d967608e" xlink:to="loc_srt_RangeMember_574175f2-bf87-4393-afd4-99b7d967608e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_65187234-9659-45b9-bc03-4f02f1017889" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_574175f2-bf87-4393-afd4-99b7d967608e" xlink:to="loc_srt_RangeMember_65187234-9659-45b9-bc03-4f02f1017889" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_0b6855b2-d9c4-4a53-81bf-ebc47fe9e1b2" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_65187234-9659-45b9-bc03-4f02f1017889" xlink:to="loc_srt_MinimumMember_0b6855b2-d9c4-4a53-81bf-ebc47fe9e1b2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_ab58cfd4-ff97-4303-8b23-aea83b0b6e37" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_65187234-9659-45b9-bc03-4f02f1017889" xlink:to="loc_srt_MaximumMember_ab58cfd4-ff97-4303-8b23-aea83b0b6e37" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems_10038450-e66f-455f-a4c9-816e6424f552" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_666b1889-7678-4e8c-a1e1-0fd9afe88045" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems_10038450-e66f-455f-a4c9-816e6424f552" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_666b1889-7678-4e8c-a1e1-0fd9afe88045" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashNoncurrent_5c76fdef-1e27-4207-a8af-5c55b9c78e3b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestrictedCashNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems_10038450-e66f-455f-a4c9-816e6424f552" xlink:to="loc_us-gaap_RestrictedCashNoncurrent_5c76fdef-1e27-4207-a8af-5c55b9c78e3b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_f1e5d318-fdd0-4a77-92ad-f77de3a0df7d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems_10038450-e66f-455f-a4c9-816e6424f552" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_f1e5d318-fdd0-4a77-92ad-f77de3a0df7d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Cash_cf5dbe02-0d7f-49f2-b957-b164a3f72231" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Cash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems_10038450-e66f-455f-a4c9-816e6424f552" xlink:to="loc_us-gaap_Cash_cf5dbe02-0d7f-49f2-b957-b164a3f72231" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTable_f0ac4f6a-e75a-4688-9b90-64b33e1ea59e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsItemsLineItems_10038450-e66f-455f-a4c9-816e6424f552" xlink:to="loc_us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTable_f0ac4f6a-e75a-4688-9b90-64b33e1ea59e" xlink:type="arc" order="2" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_b6f829e0-51c0-4133-9d84-9caa1dafdbf2" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestrictedCashAndCashEquivalentsTable_f0ac4f6a-e75a-4688-9b90-64b33e1ea59e" xlink:to="loc_srt_StatementGeographicalAxis_b6f829e0-51c0-4133-9d84-9caa1dafdbf2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_b6f829e0-51c0-4133-9d84-9caa1dafdbf2_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_SegmentGeographicalDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_050b084f-c5f9-4e1a-ad51-18fc8122e917" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_SegmentGeographicalDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_InternationalMember_c4eede1c-acce-4b5a-8515-3b07c94a674e" xlink:href="mtrx-20220630.xsd#mtrx_InternationalMember"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.matrixservicecompany.com/role/RevenueDetails" xlink:type="simple" xlink:href="mtrx-20220630.xsd#RevenueDetails"/>
  <link:definitionLink xlink:role="http://www.matrixservicecompany.com/role/RevenueDetails" xlink:type="extended" id="i00def0a3d1ea4b399d7416b4aa5755f8_RevenueDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_19e9efb7-9d6b-4dfe-8af2-6d880cc2fada" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_eb78fd01-7483-49fe-a175-0382b602607c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_19e9efb7-9d6b-4dfe-8af2-6d880cc2fada" xlink:to="loc_us-gaap_Revenues_eb78fd01-7483-49fe-a175-0382b602607c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossOnContracts_80a7a58b-5c55-4b48-ae31-d0a72aeed532" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossOnContracts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_19e9efb7-9d6b-4dfe-8af2-6d880cc2fada" xlink:to="loc_us-gaap_LossOnContracts_80a7a58b-5c55-4b48-ae31-d0a72aeed532" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerAssetCumulativeCatchUpAdjustmentToRevenueChangeInMeasureOfProgress_6439dc8f-45ae-4da1-b106-1e3418cc88ed" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerAssetCumulativeCatchUpAdjustmentToRevenueChangeInMeasureOfProgress"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_19e9efb7-9d6b-4dfe-8af2-6d880cc2fada" xlink:to="loc_us-gaap_ContractWithCustomerAssetCumulativeCatchUpAdjustmentToRevenueChangeInMeasureOfProgress_6439dc8f-45ae-4da1-b106-1e3418cc88ed" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_a99c0c46-e04c-4b0e-af18-93836c87fb01" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_19e9efb7-9d6b-4dfe-8af2-6d880cc2fada" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_a99c0c46-e04c-4b0e-af18-93836c87fb01" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_a5ebc0fd-e9a4-463f-85af-7cf7294342ad" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_a99c0c46-e04c-4b0e-af18-93836c87fb01" xlink:to="loc_srt_StatementGeographicalAxis_a5ebc0fd-e9a4-463f-85af-7cf7294342ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_a5ebc0fd-e9a4-463f-85af-7cf7294342ad_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_a5ebc0fd-e9a4-463f-85af-7cf7294342ad" xlink:to="loc_srt_SegmentGeographicalDomain_a5ebc0fd-e9a4-463f-85af-7cf7294342ad_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_4d3b80f6-9555-4d6c-8dd2-2cbc6929aa1c" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_a5ebc0fd-e9a4-463f-85af-7cf7294342ad" xlink:to="loc_srt_SegmentGeographicalDomain_4d3b80f6-9555-4d6c-8dd2-2cbc6929aa1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_8153fe0b-412a-487f-8c26-bff3f5e9b426" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_4d3b80f6-9555-4d6c-8dd2-2cbc6929aa1c" xlink:to="loc_country_US_8153fe0b-412a-487f-8c26-bff3f5e9b426" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CA_361a889f-add2-4986-9713-d031b6f0f12e" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_CA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_4d3b80f6-9555-4d6c-8dd2-2cbc6929aa1c" xlink:to="loc_country_CA_361a889f-add2-4986-9713-d031b6f0f12e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_OtherinternationalMember_57adb7da-2a95-461e-b3fe-2055c8c3d618" xlink:href="mtrx-20220630.xsd#mtrx_OtherinternationalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_4d3b80f6-9555-4d6c-8dd2-2cbc6929aa1c" xlink:to="loc_mtrx_OtherinternationalMember_57adb7da-2a95-461e-b3fe-2055c8c3d618" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_b5eb59a8-10df-46d2-a2f8-09323f6b36f3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerBasisOfPricingAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_a99c0c46-e04c-4b0e-af18-93836c87fb01" xlink:to="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_b5eb59a8-10df-46d2-a2f8-09323f6b36f3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_b5eb59a8-10df-46d2-a2f8-09323f6b36f3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerBasisOfPricingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_b5eb59a8-10df-46d2-a2f8-09323f6b36f3" xlink:to="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_b5eb59a8-10df-46d2-a2f8-09323f6b36f3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_a90293d1-d7ae-48f0-bc72-48dda2f1dea5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerBasisOfPricingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_b5eb59a8-10df-46d2-a2f8-09323f6b36f3" xlink:to="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_a90293d1-d7ae-48f0-bc72-48dda2f1dea5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedPriceContractMember_46973ccd-2d4c-44d7-97f8-4abf29c8b80c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FixedPriceContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_a90293d1-d7ae-48f0-bc72-48dda2f1dea5" xlink:to="loc_us-gaap_FixedPriceContractMember_46973ccd-2d4c-44d7-97f8-4abf29c8b80c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimeAndMaterialsContractMember_2f612ee3-a19b-4df6-acc3-dde533272dc6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TimeAndMaterialsContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_a90293d1-d7ae-48f0-bc72-48dda2f1dea5" xlink:to="loc_us-gaap_TimeAndMaterialsContractMember_2f612ee3-a19b-4df6-acc3-dde533272dc6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_a936df38-a339-49d8-b2cb-afb5529ef4d9" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_a99c0c46-e04c-4b0e-af18-93836c87fb01" xlink:to="loc_srt_MajorCustomersAxis_a936df38-a339-49d8-b2cb-afb5529ef4d9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_a936df38-a339-49d8-b2cb-afb5529ef4d9_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_a936df38-a339-49d8-b2cb-afb5529ef4d9" xlink:to="loc_srt_NameOfMajorCustomerDomain_a936df38-a339-49d8-b2cb-afb5529ef4d9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_c17e1967-dc33-4d43-9fe9-7803687ffc2f" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_a936df38-a339-49d8-b2cb-afb5529ef4d9" xlink:to="loc_srt_NameOfMajorCustomerDomain_c17e1967-dc33-4d43-9fe9-7803687ffc2f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_UtilityAndPowerInfrastructureCapitalProject1Member_8b78923f-8794-4221-985e-e44639d9bbb3" xlink:href="mtrx-20220630.xsd#mtrx_UtilityAndPowerInfrastructureCapitalProject1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_c17e1967-dc33-4d43-9fe9-7803687ffc2f" xlink:to="loc_mtrx_UtilityAndPowerInfrastructureCapitalProject1Member_8b78923f-8794-4221-985e-e44639d9bbb3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_UtilityAndPowerInfrastructureCapitalProject2Member_511f7b79-a2a0-43eb-beec-b2b80c7b954e" xlink:href="mtrx-20220630.xsd#mtrx_UtilityAndPowerInfrastructureCapitalProject2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_c17e1967-dc33-4d43-9fe9-7803687ffc2f" xlink:to="loc_mtrx_UtilityAndPowerInfrastructureCapitalProject2Member_511f7b79-a2a0-43eb-beec-b2b80c7b954e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_7f47f850-f7cf-4a46-a727-3ac759d244d5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_a99c0c46-e04c-4b0e-af18-93836c87fb01" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_7f47f850-f7cf-4a46-a727-3ac759d244d5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_7f47f850-f7cf-4a46-a727-3ac759d244d5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_7f47f850-f7cf-4a46-a727-3ac759d244d5" xlink:to="loc_us-gaap_SegmentDomain_7f47f850-f7cf-4a46-a727-3ac759d244d5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_ca036da3-e5bd-4516-91bf-98a047cbbed6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_7f47f850-f7cf-4a46-a727-3ac759d244d5" xlink:to="loc_us-gaap_SegmentDomain_ca036da3-e5bd-4516-91bf-98a047cbbed6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_ProcessAndIndustrialFacilitiesSegmentMember_fba3040d-8261-4c15-b277-52403117750b" xlink:href="mtrx-20220630.xsd#mtrx_ProcessAndIndustrialFacilitiesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_ca036da3-e5bd-4516-91bf-98a047cbbed6" xlink:to="loc_mtrx_ProcessAndIndustrialFacilitiesSegmentMember_fba3040d-8261-4c15-b277-52403117750b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_UtilityAndPowerInfrastructureMemberMember_d7cfe57a-4172-480e-8e84-505e15903955" xlink:href="mtrx-20220630.xsd#mtrx_UtilityAndPowerInfrastructureMemberMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_ca036da3-e5bd-4516-91bf-98a047cbbed6" xlink:to="loc_mtrx_UtilityAndPowerInfrastructureMemberMember_d7cfe57a-4172-480e-8e84-505e15903955" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_StorageAndTerminalSolutionsSegmentMember_f80e1c04-303d-45b6-b62c-5f3c35aac229" xlink:href="mtrx-20220630.xsd#mtrx_StorageAndTerminalSolutionsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_ca036da3-e5bd-4516-91bf-98a047cbbed6" xlink:to="loc_mtrx_StorageAndTerminalSolutionsSegmentMember_f80e1c04-303d-45b6-b62c-5f3c35aac229" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_afe37226-1624-474e-b81b-5ddc31c37fb2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_f42cf5aa-4abd-4765-b1a1-4dc7517f9d53" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Revenues"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerAssetCumulativeCatchUpAdjustmentToRevenueChangeInMeasureOfProgress_e1c6f9db-d3a6-4cd6-b37a-dd63719bc5ea" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerAssetCumulativeCatchUpAdjustmentToRevenueChangeInMeasureOfProgress"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_b85dfb1b-e913-49f3-9efb-6ef3c79a8b54" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_df645bf3-f555-467e-a38e-c092dc4aecc1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerBasisOfPricingAxis"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_df645bf3-f555-467e-a38e-c092dc4aecc1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerBasisOfPricingDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_e14a6a07-afee-4604-80ff-a206202eef86" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerBasisOfPricingDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedPriceContractMember_eea59d55-0bfd-4c7e-bd77-11a30ccb0031" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FixedPriceContractMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_0b1f892f-2820-4f26-9bde-bbe7f383b9e5" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MajorCustomersAxis"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_0b1f892f-2820-4f26-9bde-bbe7f383b9e5_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_179b2c1c-7257-4036-a8f4-1361c682c20e" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_UtilityAndPowerInfrastructureCapitalProject2Member_c3cef97a-a254-49e7-b2f4-40157a7bf1c5" xlink:href="mtrx-20220630.xsd#mtrx_UtilityAndPowerInfrastructureCapitalProject2Member"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_ead83fc4-d3b1-4509-94fd-350d21a57ab5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_ead83fc4-d3b1-4509-94fd-350d21a57ab5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_2b73f5d7-b6cc-4bc2-be16-fe5fb8a598ae" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_UtilityAndPowerInfrastructureMemberMember_5c6c0120-94f2-4f51-85d0-c88c3cfb9892" xlink:href="mtrx-20220630.xsd#mtrx_UtilityAndPowerInfrastructureMemberMember"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.matrixservicecompany.com/role/PropertyPlantandEquipmentDetails" xlink:type="simple" xlink:href="mtrx-20220630.xsd#PropertyPlantandEquipmentDetails"/>
  <link:definitionLink xlink:role="http://www.matrixservicecompany.com/role/PropertyPlantandEquipmentDetails" xlink:type="extended" id="ie55d79d0b18f44ebb967914b6bc63c94_PropertyPlantandEquipmentDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_8612523b-cc67-4fd2-b0d6-e25842dd28b9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_LandBuildingsAndImprovementsGross_f759cc5f-bf91-44f6-a438-0c37e590731e" xlink:href="mtrx-20220630.xsd#mtrx_LandBuildingsAndImprovementsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_8612523b-cc67-4fd2-b0d6-e25842dd28b9" xlink:to="loc_mtrx_LandBuildingsAndImprovementsGross_f759cc5f-bf91-44f6-a438-0c37e590731e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MachineryAndEquipmentGross_9c111018-ac9b-4778-ae46-081fb6095d47" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MachineryAndEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_8612523b-cc67-4fd2-b0d6-e25842dd28b9" xlink:to="loc_us-gaap_MachineryAndEquipmentGross_9c111018-ac9b-4778-ae46-081fb6095d47" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_TransportationEquipmentGross_3950e880-7181-43d7-9395-f01234c11de6" xlink:href="mtrx-20220630.xsd#mtrx_TransportationEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_8612523b-cc67-4fd2-b0d6-e25842dd28b9" xlink:to="loc_mtrx_TransportationEquipmentGross_3950e880-7181-43d7-9395-f01234c11de6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_OfficeEquipmentAndCapitalizedComputerSoftwareGross_c05c244d-1f7d-4b71-93a2-a0e34b48a258" xlink:href="mtrx-20220630.xsd#mtrx_OfficeEquipmentAndCapitalizedComputerSoftwareGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_8612523b-cc67-4fd2-b0d6-e25842dd28b9" xlink:to="loc_mtrx_OfficeEquipmentAndCapitalizedComputerSoftwareGross_c05c244d-1f7d-4b71-93a2-a0e34b48a258" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConstructionInProgressGross_76216e23-8870-4ced-b532-c4d1bf6d688a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConstructionInProgressGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_8612523b-cc67-4fd2-b0d6-e25842dd28b9" xlink:to="loc_us-gaap_ConstructionInProgressGross_76216e23-8870-4ced-b532-c4d1bf6d688a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_630cfbd6-9f01-4700-9c3a-014e7beff9a1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_8612523b-cc67-4fd2-b0d6-e25842dd28b9" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_630cfbd6-9f01-4700-9c3a-014e7beff9a1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_6053135a-20a4-4542-9f2a-c2cd608c0255" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_8612523b-cc67-4fd2-b0d6-e25842dd28b9" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_6053135a-20a4-4542-9f2a-c2cd608c0255" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_06e5d346-4729-4030-9b59-05e05afdbf65" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_8612523b-cc67-4fd2-b0d6-e25842dd28b9" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_06e5d346-4729-4030-9b59-05e05afdbf65" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncurrentAssets_9bbfb42f-e35f-463c-829d-98a6b18171fa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_8612523b-cc67-4fd2-b0d6-e25842dd28b9" xlink:to="loc_us-gaap_NoncurrentAssets_9bbfb42f-e35f-463c-829d-98a6b18171fa" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfProductiveAssets_7aa6fb5e-e065-44a5-b345-6ab8220f00cb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromSaleOfProductiveAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_8612523b-cc67-4fd2-b0d6-e25842dd28b9" xlink:to="loc_us-gaap_ProceedsFromSaleOfProductiveAssets_7aa6fb5e-e065-44a5-b345-6ab8220f00cb" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_181b4266-ee3e-4078-8e01-9789b97085f1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GainLossOnSaleOfPropertyPlantEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_8612523b-cc67-4fd2-b0d6-e25842dd28b9" xlink:to="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_181b4266-ee3e-4078-8e01-9789b97085f1" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_c0ca830c-b8cd-4c7c-b947-79eae77c22d4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_8612523b-cc67-4fd2-b0d6-e25842dd28b9" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_c0ca830c-b8cd-4c7c-b947-79eae77c22d4" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_76ec9617-5735-43a8-8eec-db84c131910e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_8612523b-cc67-4fd2-b0d6-e25842dd28b9" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_76ec9617-5735-43a8-8eec-db84c131910e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_b7257701-fc44-40d3-b82a-fc13903a21a2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_76ec9617-5735-43a8-8eec-db84c131910e" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_b7257701-fc44-40d3-b82a-fc13903a21a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_b7257701-fc44-40d3-b82a-fc13903a21a2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_b7257701-fc44-40d3-b82a-fc13903a21a2" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_b7257701-fc44-40d3-b82a-fc13903a21a2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f6234703-e53d-426a-9954-eb96fd0b0ec3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_b7257701-fc44-40d3-b82a-fc13903a21a2" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_f6234703-e53d-426a-9954-eb96fd0b0ec3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_fefcd832-5c12-4a8b-8c7f-416d2e82bedb" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_76ec9617-5735-43a8-8eec-db84c131910e" xlink:to="loc_srt_RangeAxis_fefcd832-5c12-4a8b-8c7f-416d2e82bedb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_fefcd832-5c12-4a8b-8c7f-416d2e82bedb_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_fefcd832-5c12-4a8b-8c7f-416d2e82bedb" xlink:to="loc_srt_RangeMember_fefcd832-5c12-4a8b-8c7f-416d2e82bedb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_95f0940f-57cf-43d1-ac32-243e276db3ab" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_fefcd832-5c12-4a8b-8c7f-416d2e82bedb" xlink:to="loc_srt_RangeMember_95f0940f-57cf-43d1-ac32-243e276db3ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_3e9c07d6-7727-4312-aa6e-caea76e7604a" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_76ec9617-5735-43a8-8eec-db84c131910e" xlink:to="loc_srt_StatementGeographicalAxis_3e9c07d6-7727-4312-aa6e-caea76e7604a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_3e9c07d6-7727-4312-aa6e-caea76e7604a_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_3e9c07d6-7727-4312-aa6e-caea76e7604a" xlink:to="loc_srt_SegmentGeographicalDomain_3e9c07d6-7727-4312-aa6e-caea76e7604a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_ff0b025f-31f0-4eaa-b4f3-f4c58525a659" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_3e9c07d6-7727-4312-aa6e-caea76e7604a" xlink:to="loc_srt_SegmentGeographicalDomain_ff0b025f-31f0-4eaa-b4f3-f4c58525a659" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_dd05baa2-7395-4a4b-9f49-0fc8976d9b6a" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_ff0b025f-31f0-4eaa-b4f3-f4c58525a659" xlink:to="loc_country_US_dd05baa2-7395-4a4b-9f49-0fc8976d9b6a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CA_748ecc78-3d38-460e-bbcf-1ef7a07f7cbe" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_CA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_ff0b025f-31f0-4eaa-b4f3-f4c58525a659" xlink:to="loc_country_CA_748ecc78-3d38-460e-bbcf-1ef7a07f7cbe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_InternationalMember_ce9c0c41-ab44-4e4c-ae82-8ecc70c3135e" xlink:href="mtrx-20220630.xsd#mtrx_InternationalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_ff0b025f-31f0-4eaa-b4f3-f4c58525a659" xlink:to="loc_mtrx_InternationalMember_ce9c0c41-ab44-4e4c-ae82-8ecc70c3135e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_3f1d3115-7288-4049-85b7-c122c18b7c31" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_76ec9617-5735-43a8-8eec-db84c131910e" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_3f1d3115-7288-4049-85b7-c122c18b7c31" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_3f1d3115-7288-4049-85b7-c122c18b7c31_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_3f1d3115-7288-4049-85b7-c122c18b7c31" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_3f1d3115-7288-4049-85b7-c122c18b7c31_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_27547b1e-62fc-4340-b419-5a0aafd6d2e3" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_3f1d3115-7288-4049-85b7-c122c18b7c31" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_27547b1e-62fc-4340-b419-5a0aafd6d2e3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_OrangeCaliforniaFacilityMember_13b30d74-b4c2-4a8b-bc69-d6980ce3d4fd" xlink:href="mtrx-20220630.xsd#mtrx_OrangeCaliforniaFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_27547b1e-62fc-4340-b419-5a0aafd6d2e3" xlink:to="loc_mtrx_OrangeCaliforniaFacilityMember_13b30d74-b4c2-4a8b-bc69-d6980ce3d4fd" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.matrixservicecompany.com/role/GoodwillandOtherIntangibleAssetsDetails" xlink:type="simple" xlink:href="mtrx-20220630.xsd#GoodwillandOtherIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.matrixservicecompany.com/role/GoodwillandOtherIntangibleAssetsDetails" xlink:type="extended" id="i9bd85779177e4359b2ed28c960ec59f5_GoodwillandOtherIntangibleAssetsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_92de4e39-bd20-4792-9beb-49ca4bc7fab3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillRollForward_55fa0855-752f-4f13-8a8c-d6aba9d33cc1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GoodwillRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_92de4e39-bd20-4792-9beb-49ca4bc7fab3" xlink:to="loc_us-gaap_GoodwillRollForward_55fa0855-752f-4f13-8a8c-d6aba9d33cc1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_ed777ff5-94fc-48ac-9b05-248aa48357ff" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_55fa0855-752f-4f13-8a8c-d6aba9d33cc1" xlink:to="loc_us-gaap_Goodwill_ed777ff5-94fc-48ac-9b05-248aa48357ff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_ccaf2b3a-1e6a-4663-8724-110ef4753cab" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GoodwillImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_55fa0855-752f-4f13-8a8c-d6aba9d33cc1" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_ccaf2b3a-1e6a-4663-8724-110ef4753cab" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_99eb5f86-e55c-471c-bda8-15310245d7e5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_55fa0855-752f-4f13-8a8c-d6aba9d33cc1" xlink:to="loc_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_99eb5f86-e55c-471c-bda8-15310245d7e5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_898c64a4-ec32-4f04-86a4-d47389ae1f92" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GoodwillForeignCurrencyTranslationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_55fa0855-752f-4f13-8a8c-d6aba9d33cc1" xlink:to="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_898c64a4-ec32-4f04-86a4-d47389ae1f92" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_b453cfbc-5863-43a8-890a-c213ad6a34db" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Goodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_GoodwillAttributableToReportingUnitsAtRiskForImpairment_97950dd5-6370-4822-a0a4-b38a3e4c6094" xlink:href="mtrx-20220630.xsd#mtrx_GoodwillAttributableToReportingUnitsAtRiskForImpairment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_55fa0855-752f-4f13-8a8c-d6aba9d33cc1" xlink:to="loc_mtrx_GoodwillAttributableToReportingUnitsAtRiskForImpairment_97950dd5-6370-4822-a0a4-b38a3e4c6094" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_4c39dd83-d475-4f3e-9ec7-862c3ce1cc3d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_92de4e39-bd20-4792-9beb-49ca4bc7fab3" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_4c39dd83-d475-4f3e-9ec7-862c3ce1cc3d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_8c0b891b-e489-487b-95ee-86088c19636c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_4c39dd83-d475-4f3e-9ec7-862c3ce1cc3d" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_8c0b891b-e489-487b-95ee-86088c19636c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_8c0b891b-e489-487b-95ee-86088c19636c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_8c0b891b-e489-487b-95ee-86088c19636c" xlink:to="loc_us-gaap_SegmentDomain_8c0b891b-e489-487b-95ee-86088c19636c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_cfb272b6-6baf-4224-af86-0c8288d79fa0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_8c0b891b-e489-487b-95ee-86088c19636c" xlink:to="loc_us-gaap_SegmentDomain_cfb272b6-6baf-4224-af86-0c8288d79fa0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_ElectricalInfrastructureMember_e4d6b64f-9258-4c5e-9ce7-16e681280f70" xlink:href="mtrx-20220630.xsd#mtrx_ElectricalInfrastructureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_cfb272b6-6baf-4224-af86-0c8288d79fa0" xlink:to="loc_mtrx_ElectricalInfrastructureMember_e4d6b64f-9258-4c5e-9ce7-16e681280f70" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_OilGasAndChemicalMember_f4ada555-18e2-4fa4-978e-51fd1d62ecd5" xlink:href="mtrx-20220630.xsd#mtrx_OilGasAndChemicalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_cfb272b6-6baf-4224-af86-0c8288d79fa0" xlink:to="loc_mtrx_OilGasAndChemicalMember_f4ada555-18e2-4fa4-978e-51fd1d62ecd5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_StorageSolutionsMember_e3b08cfe-6461-41bb-a8f2-270b358a583d" xlink:href="mtrx-20220630.xsd#mtrx_StorageSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_cfb272b6-6baf-4224-af86-0c8288d79fa0" xlink:to="loc_mtrx_StorageSolutionsMember_e3b08cfe-6461-41bb-a8f2-270b358a583d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_IndustrialMember_dd9dd00f-1da5-4267-89bb-6e6ba7ac26e8" xlink:href="mtrx-20220630.xsd#mtrx_IndustrialMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_cfb272b6-6baf-4224-af86-0c8288d79fa0" xlink:to="loc_mtrx_IndustrialMember_dd9dd00f-1da5-4267-89bb-6e6ba7ac26e8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_ReportingUnitMember_cfb27d75-ff2c-4da7-bf5a-bd287ba5ddc6" xlink:href="mtrx-20220630.xsd#mtrx_ReportingUnitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_cfb272b6-6baf-4224-af86-0c8288d79fa0" xlink:to="loc_mtrx_ReportingUnitMember_cfb27d75-ff2c-4da7-bf5a-bd287ba5ddc6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_UtilityAndPowerInfrastructureSegmentMember_5542d98b-5a08-4095-a78b-0abe6ffeefbf" xlink:href="mtrx-20220630.xsd#mtrx_UtilityAndPowerInfrastructureSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_cfb272b6-6baf-4224-af86-0c8288d79fa0" xlink:to="loc_mtrx_UtilityAndPowerInfrastructureSegmentMember_5542d98b-5a08-4095-a78b-0abe6ffeefbf" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_ProcessAndIndustrialFacilitiesSegmentMember_cb400cc2-e48d-4b63-8aee-d63e932b262d" xlink:href="mtrx-20220630.xsd#mtrx_ProcessAndIndustrialFacilitiesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_cfb272b6-6baf-4224-af86-0c8288d79fa0" xlink:to="loc_mtrx_ProcessAndIndustrialFacilitiesSegmentMember_cb400cc2-e48d-4b63-8aee-d63e932b262d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_MtrxStorageandTerminalSolutionsSegment_8830f5b4-46f8-43cd-ba0c-e47ede7b6b8b" xlink:href="mtrx-20220630.xsd#mtrx_MtrxStorageandTerminalSolutionsSegment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_cfb272b6-6baf-4224-af86-0c8288d79fa0" xlink:to="loc_mtrx_MtrxStorageandTerminalSolutionsSegment_8830f5b4-46f8-43cd-ba0c-e47ede7b6b8b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_StorageAndTerminalSolutionsSegmentMember_9eeb8c06-33b6-4992-8749-8045904712a3" xlink:href="mtrx-20220630.xsd#mtrx_StorageAndTerminalSolutionsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_cfb272b6-6baf-4224-af86-0c8288d79fa0" xlink:to="loc_mtrx_StorageAndTerminalSolutionsSegmentMember_9eeb8c06-33b6-4992-8749-8045904712a3" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.matrixservicecompany.com/role/GoodwillandOtherIntangibleAssetsDetailsTextual" xlink:type="simple" xlink:href="mtrx-20220630.xsd#GoodwillandOtherIntangibleAssetsDetailsTextual"/>
  <link:definitionLink xlink:role="http://www.matrixservicecompany.com/role/GoodwillandOtherIntangibleAssetsDetailsTextual" xlink:type="extended" id="i44a3f18426824de799fbe4624fb5f8b9_GoodwillandOtherIntangibleAssetsDetailsTextual">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_27e55cad-6c40-4dbf-b40e-8f4c5ca1a5b9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfIntangibleAssetsFinitelived_7d19ce76-fe3f-46a6-85f9-852c596ab863" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ImpairmentOfIntangibleAssetsFinitelived"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_27e55cad-6c40-4dbf-b40e-8f4c5ca1a5b9" xlink:to="loc_us-gaap_ImpairmentOfIntangibleAssetsFinitelived_7d19ce76-fe3f-46a6-85f9-852c596ab863" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1_d5b1937d-7dfd-47c8-8f83-9231cf312b1e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_27e55cad-6c40-4dbf-b40e-8f4c5ca1a5b9" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsRemainingAmortizationPeriod1_d5b1937d-7dfd-47c8-8f83-9231cf312b1e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_69f17a80-023a-4d30-907d-4f5567a48171" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_27e55cad-6c40-4dbf-b40e-8f4c5ca1a5b9" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_69f17a80-023a-4d30-907d-4f5567a48171" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_bcc86961-ec57-4d9a-825e-9e500b10b6ff" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_27e55cad-6c40-4dbf-b40e-8f4c5ca1a5b9" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_bcc86961-ec57-4d9a-825e-9e500b10b6ff" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_365011a2-4048-4ca6-a1d9-643cf334aad4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_27e55cad-6c40-4dbf-b40e-8f4c5ca1a5b9" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_365011a2-4048-4ca6-a1d9-643cf334aad4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_08a911be-f2ea-47f2-ac47-5629572911b8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_365011a2-4048-4ca6-a1d9-643cf334aad4" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_08a911be-f2ea-47f2-ac47-5629572911b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_08a911be-f2ea-47f2-ac47-5629572911b8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_08a911be-f2ea-47f2-ac47-5629572911b8" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_08a911be-f2ea-47f2-ac47-5629572911b8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ef6c358f-6b30-4bd9-8a38-5bc10be1b4e7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_08a911be-f2ea-47f2-ac47-5629572911b8" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ef6c358f-6b30-4bd9-8a38-5bc10be1b4e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_CustomerRelationshipImpairment1Member_26540700-0767-4427-95c0-e64f3dc0ec96" xlink:href="mtrx-20220630.xsd#mtrx_CustomerRelationshipImpairment1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ef6c358f-6b30-4bd9-8a38-5bc10be1b4e7" xlink:to="loc_mtrx_CustomerRelationshipImpairment1Member_26540700-0767-4427-95c0-e64f3dc0ec96" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_CustomerRelationshipImpairment2Member_f99dc4d8-1ea7-4c3f-82a6-1006e6e9464b" xlink:href="mtrx-20220630.xsd#mtrx_CustomerRelationshipImpairment2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ef6c358f-6b30-4bd9-8a38-5bc10be1b4e7" xlink:to="loc_mtrx_CustomerRelationshipImpairment2Member_f99dc4d8-1ea7-4c3f-82a6-1006e6e9464b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_CustomerRelationshipImpairment3Member_fd91fedf-1b01-4eb2-ba81-c60e2bc8b9e2" xlink:href="mtrx-20220630.xsd#mtrx_CustomerRelationshipImpairment3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ef6c358f-6b30-4bd9-8a38-5bc10be1b4e7" xlink:to="loc_mtrx_CustomerRelationshipImpairment3Member_fd91fedf-1b01-4eb2-ba81-c60e2bc8b9e2" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.matrixservicecompany.com/role/GoodwillandOtherIntangibleAssetsDetails1" xlink:type="simple" xlink:href="mtrx-20220630.xsd#GoodwillandOtherIntangibleAssetsDetails1"/>
  <link:definitionLink xlink:role="http://www.matrixservicecompany.com/role/GoodwillandOtherIntangibleAssetsDetails1" xlink:type="extended" id="ic92da48c401a455e96218ca234d66717_GoodwillandOtherIntangibleAssetsDetails1">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_81112d6a-f035-4487-bfda-81d7f2f23061" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedTradeNamesGross_222408ac-7116-4a6e-b374-196df1e4f5d0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedTradeNamesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_81112d6a-f035-4487-bfda-81d7f2f23061" xlink:to="loc_us-gaap_FiniteLivedTradeNamesGross_222408ac-7116-4a6e-b374-196df1e4f5d0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsFairValueDisclosure_21c16ce2-78a7-4044-9926-cc86155b9b2d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_81112d6a-f035-4487-bfda-81d7f2f23061" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsFairValueDisclosure_21c16ce2-78a7-4044-9926-cc86155b9b2d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwillAbstract_a09755b4-2541-4739-baec-d1cbf386f1b4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwillAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_81112d6a-f035-4487-bfda-81d7f2f23061" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwillAbstract_a09755b4-2541-4739-baec-d1cbf386f1b4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_668d76eb-c49e-4276-be22-27f47745a910" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwillAbstract_a09755b4-2541-4739-baec-d1cbf386f1b4" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_668d76eb-c49e-4276-be22-27f47745a910" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_9e793cac-ad35-435c-808a-db1354af503f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwillAbstract_a09755b4-2541-4739-baec-d1cbf386f1b4" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_9e793cac-ad35-435c-808a-db1354af503f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_9ec51000-541c-45cd-a658-6450cda48f2c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwillAbstract_a09755b4-2541-4739-baec-d1cbf386f1b4" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_9ec51000-541c-45cd-a658-6450cda48f2c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_acab255e-8ce0-4e6f-95b5-c2d684c0a737" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwillAbstract_a09755b4-2541-4739-baec-d1cbf386f1b4" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_acab255e-8ce0-4e6f-95b5-c2d684c0a737" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_a5a991e6-a825-4dba-a918-576549525cb7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IntangibleAssetsNetExcludingGoodwillAbstract_a09755b4-2541-4739-baec-d1cbf386f1b4" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_a5a991e6-a825-4dba-a918-576549525cb7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_f85b1b1b-3b7b-416e-a85c-02d598721fe2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_81112d6a-f035-4487-bfda-81d7f2f23061" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_f85b1b1b-3b7b-416e-a85c-02d598721fe2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_7beeaf84-1275-4ca7-9fc8-3b829e62be24" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_f85b1b1b-3b7b-416e-a85c-02d598721fe2" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_7beeaf84-1275-4ca7-9fc8-3b829e62be24" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_7beeaf84-1275-4ca7-9fc8-3b829e62be24_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_7beeaf84-1275-4ca7-9fc8-3b829e62be24" xlink:to="loc_us-gaap_SegmentDomain_7beeaf84-1275-4ca7-9fc8-3b829e62be24_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_2d9c4364-0009-46c8-a8e7-7c1472046734" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_7beeaf84-1275-4ca7-9fc8-3b829e62be24" xlink:to="loc_us-gaap_SegmentDomain_2d9c4364-0009-46c8-a8e7-7c1472046734" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_ReportingUnitMember_568526fa-5c59-4c49-a09d-66f81b8eadd6" xlink:href="mtrx-20220630.xsd#mtrx_ReportingUnitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_2d9c4364-0009-46c8-a8e7-7c1472046734" xlink:to="loc_mtrx_ReportingUnitMember_568526fa-5c59-4c49-a09d-66f81b8eadd6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_4194cb99-d329-46e3-8cb7-22965b379e63" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_f85b1b1b-3b7b-416e-a85c-02d598721fe2" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_4194cb99-d329-46e3-8cb7-22965b379e63" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_4194cb99-d329-46e3-8cb7-22965b379e63_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_4194cb99-d329-46e3-8cb7-22965b379e63" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_4194cb99-d329-46e3-8cb7-22965b379e63_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_883102f6-eed1-4c9e-81da-4a3906ef5d65" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_4194cb99-d329-46e3-8cb7-22965b379e63" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_883102f6-eed1-4c9e-81da-4a3906ef5d65" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_BaillieTankEquipmentLtd.Member_d4cfeb9a-d972-44a3-bdcd-e9733615652f" xlink:href="mtrx-20220630.xsd#mtrx_BaillieTankEquipmentLtd.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_883102f6-eed1-4c9e-81da-4a3906ef5d65" xlink:to="loc_mtrx_BaillieTankEquipmentLtd.Member_d4cfeb9a-d972-44a3-bdcd-e9733615652f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_HoustonInterestsLLCMember_3eaebd88-2467-41d5-ab5f-cd42677e103a" xlink:href="mtrx-20220630.xsd#mtrx_HoustonInterestsLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_883102f6-eed1-4c9e-81da-4a3906ef5d65" xlink:to="loc_mtrx_HoustonInterestsLLCMember_3eaebd88-2467-41d5-ab5f-cd42677e103a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_a8912ff4-3516-49d2-ad62-fb5d5972e4aa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_f85b1b1b-3b7b-416e-a85c-02d598721fe2" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_a8912ff4-3516-49d2-ad62-fb5d5972e4aa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a8912ff4-3516-49d2-ad62-fb5d5972e4aa_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_a8912ff4-3516-49d2-ad62-fb5d5972e4aa" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a8912ff4-3516-49d2-ad62-fb5d5972e4aa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_ebf5b05b-0448-420c-a0e7-0fd2bcf5cd11" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_a8912ff4-3516-49d2-ad62-fb5d5972e4aa" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_ebf5b05b-0448-420c-a0e7-0fd2bcf5cd11" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_SMElectricTradeNameMember_945ef713-f896-4bb6-92d6-0b57208e23f2" xlink:href="mtrx-20220630.xsd#mtrx_SMElectricTradeNameMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_ebf5b05b-0448-420c-a0e7-0fd2bcf5cd11" xlink:to="loc_mtrx_SMElectricTradeNameMember_945ef713-f896-4bb6-92d6-0b57208e23f2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntellectualPropertyMember_37cef820-0d13-4cb8-b1e2-c4d92d43f677" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IntellectualPropertyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_ebf5b05b-0448-420c-a0e7-0fd2bcf5cd11" xlink:to="loc_us-gaap_IntellectualPropertyMember_37cef820-0d13-4cb8-b1e2-c4d92d43f677" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_CustomerBasedMember_04a217a7-15b9-492b-b58c-20fff907c014" xlink:href="mtrx-20220630.xsd#mtrx_CustomerBasedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_ebf5b05b-0448-420c-a0e7-0fd2bcf5cd11" xlink:to="loc_mtrx_CustomerBasedMember_04a217a7-15b9-492b-b58c-20fff907c014" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncompeteAgreementsMember_324a2031-9ab0-43b3-bbae-809da2aed65c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NoncompeteAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_ebf5b05b-0448-420c-a0e7-0fd2bcf5cd11" xlink:to="loc_us-gaap_NoncompeteAgreementsMember_324a2031-9ab0-43b3-bbae-809da2aed65c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_37e97497-f5ba-4e4a-aab7-d5392c0a1056" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_ebf5b05b-0448-420c-a0e7-0fd2bcf5cd11" xlink:to="loc_us-gaap_TradeNamesMember_37e97497-f5ba-4e4a-aab7-d5392c0a1056" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_080d7a5f-d4bd-42d7-b4b8-04831f00e5aa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_f85b1b1b-3b7b-416e-a85c-02d598721fe2" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_080d7a5f-d4bd-42d7-b4b8-04831f00e5aa" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_080d7a5f-d4bd-42d7-b4b8-04831f00e5aa_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_080d7a5f-d4bd-42d7-b4b8-04831f00e5aa" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_080d7a5f-d4bd-42d7-b4b8-04831f00e5aa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_2cfb7f03-4ede-4bd1-a346-44ad6f3184af" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_080d7a5f-d4bd-42d7-b4b8-04831f00e5aa" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_2cfb7f03-4ede-4bd1-a346-44ad6f3184af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_fde08b44-6f45-42f1-abc8-cc15a142071b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_2cfb7f03-4ede-4bd1-a346-44ad6f3184af" xlink:to="loc_us-gaap_TradeNamesMember_fde08b44-6f45-42f1-abc8-cc15a142071b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_289a92ff-394f-4007-891f-5cc2fcf4aede" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_f85b1b1b-3b7b-416e-a85c-02d598721fe2" xlink:to="loc_srt_RangeAxis_289a92ff-394f-4007-891f-5cc2fcf4aede" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_289a92ff-394f-4007-891f-5cc2fcf4aede_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_289a92ff-394f-4007-891f-5cc2fcf4aede" xlink:to="loc_srt_RangeMember_289a92ff-394f-4007-891f-5cc2fcf4aede_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_187eae3a-8e09-4b29-824f-88add768a6b7" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_289a92ff-394f-4007-891f-5cc2fcf4aede" xlink:to="loc_srt_RangeMember_187eae3a-8e09-4b29-824f-88add768a6b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_5b31a381-ef50-4f96-a96e-d08c6bfabdfa" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_187eae3a-8e09-4b29-824f-88add768a6b7" xlink:to="loc_srt_MinimumMember_5b31a381-ef50-4f96-a96e-d08c6bfabdfa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_6bc41c2f-22a4-4ede-b98d-fcd2877e4361" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_187eae3a-8e09-4b29-824f-88add768a6b7" xlink:to="loc_srt_MaximumMember_6bc41c2f-22a4-4ede-b98d-fcd2877e4361" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.matrixservicecompany.com/role/DebtDetailsTextual" xlink:type="simple" xlink:href="mtrx-20220630.xsd#DebtDetailsTextual"/>
  <link:definitionLink xlink:role="http://www.matrixservicecompany.com/role/DebtDetailsTextual" xlink:type="extended" id="icdd155b02b9341c2b7e478b2f4adcccf_DebtDetailsTextual">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_4e153529-3fd7-4b3b-bd4c-0b094debce94" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_DebtTextualAbstract_14a32bbf-c110-47cf-8bd8-a658c228cb56" xlink:href="mtrx-20220630.xsd#mtrx_DebtTextualAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_4e153529-3fd7-4b3b-bd4c-0b094debce94" xlink:to="loc_mtrx_DebtTextualAbstract_14a32bbf-c110-47cf-8bd8-a658c228cb56" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_5617802f-f62d-488a-a7d4-9c09fd15cbad" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtrx_DebtTextualAbstract_14a32bbf-c110-47cf-8bd8-a658c228cb56" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_5617802f-f62d-488a-a7d4-9c09fd15cbad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityExpirationDate1_0e09214e-e580-43cb-abbb-c7ace6449c6b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityExpirationDate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtrx_DebtTextualAbstract_14a32bbf-c110-47cf-8bd8-a658c228cb56" xlink:to="loc_us-gaap_LineOfCreditFacilityExpirationDate1_0e09214e-e580-43cb-abbb-c7ace6449c6b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_b45e8b00-7a4f-4da5-8b27-8dde94814715" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtrx_DebtTextualAbstract_14a32bbf-c110-47cf-8bd8-a658c228cb56" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_b45e8b00-7a4f-4da5-8b27-8dde94814715" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_1330d40e-1a60-4058-b097-6f2c7869cdb6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_4e153529-3fd7-4b3b-bd4c-0b094debce94" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_1330d40e-1a60-4058-b097-6f2c7869cdb6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_24dbf855-1d06-4f62-a5ee-c515fb61a94b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_1330d40e-1a60-4058-b097-6f2c7869cdb6" xlink:to="loc_us-gaap_VariableRateAxis_24dbf855-1d06-4f62-a5ee-c515fb61a94b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_24dbf855-1d06-4f62-a5ee-c515fb61a94b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_24dbf855-1d06-4f62-a5ee-c515fb61a94b" xlink:to="loc_us-gaap_VariableRateDomain_24dbf855-1d06-4f62-a5ee-c515fb61a94b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_32bd2eb7-5ed9-416b-a675-02e50d865e65" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_24dbf855-1d06-4f62-a5ee-c515fb61a94b" xlink:to="loc_us-gaap_VariableRateDomain_32bd2eb7-5ed9-416b-a675-02e50d865e65" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_CdorRateMember_ff409754-0c94-41bc-9820-94d270c16ae5" xlink:href="mtrx-20220630.xsd#mtrx_CdorRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_32bd2eb7-5ed9-416b-a675-02e50d865e65" xlink:to="loc_mtrx_CdorRateMember_ff409754-0c94-41bc-9820-94d270c16ae5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_CanadianPrimeRateMember_ae1c50b4-4c2e-4764-b5e1-8e5f17642e49" xlink:href="mtrx-20220630.xsd#mtrx_CanadianPrimeRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_32bd2eb7-5ed9-416b-a675-02e50d865e65" xlink:to="loc_mtrx_CanadianPrimeRateMember_ae1c50b4-4c2e-4764-b5e1-8e5f17642e49" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_f216f971-2304-4f8c-b038-896ce7b51571" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_1330d40e-1a60-4058-b097-6f2c7869cdb6" xlink:to="loc_srt_RangeAxis_f216f971-2304-4f8c-b038-896ce7b51571" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_f216f971-2304-4f8c-b038-896ce7b51571_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_f216f971-2304-4f8c-b038-896ce7b51571" xlink:to="loc_srt_RangeMember_f216f971-2304-4f8c-b038-896ce7b51571_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_4a945da1-bc3d-4d7d-9f38-1a29dcc0a5c5" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_f216f971-2304-4f8c-b038-896ce7b51571" xlink:to="loc_srt_RangeMember_4a945da1-bc3d-4d7d-9f38-1a29dcc0a5c5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_f17566a5-680a-4895-8988-65830a261eb3" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_4a945da1-bc3d-4d7d-9f38-1a29dcc0a5c5" xlink:to="loc_srt_MinimumMember_f17566a5-680a-4895-8988-65830a261eb3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_76e6e4c7-13eb-4a3a-ab89-8494699b9549" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_4a945da1-bc3d-4d7d-9f38-1a29dcc0a5c5" xlink:to="loc_srt_MaximumMember_76e6e4c7-13eb-4a3a-ab89-8494699b9549" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityAxis_3a248764-23bb-48f4-867c-81b117c7e1a4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_1330d40e-1a60-4058-b097-6f2c7869cdb6" xlink:to="loc_us-gaap_LineOfCreditFacilityAxis_3a248764-23bb-48f4-867c-81b117c7e1a4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLenderDomain_3a248764-23bb-48f4-867c-81b117c7e1a4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityLenderDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LineOfCreditFacilityAxis_3a248764-23bb-48f4-867c-81b117c7e1a4" xlink:to="loc_us-gaap_LineOfCreditFacilityLenderDomain_3a248764-23bb-48f4-867c-81b117c7e1a4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLenderDomain_cf23826c-86d5-4430-bf0a-3403a37ab364" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityLenderDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LineOfCreditFacilityAxis_3a248764-23bb-48f4-867c-81b117c7e1a4" xlink:to="loc_us-gaap_LineOfCreditFacilityLenderDomain_cf23826c-86d5-4430-bf0a-3403a37ab364" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_JPMorganChaseBankMember_7be9e0d5-9368-4553-8532-f49ed2a5dc7a" xlink:href="mtrx-20220630.xsd#mtrx_JPMorganChaseBankMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLenderDomain_cf23826c-86d5-4430-bf0a-3403a37ab364" xlink:to="loc_mtrx_JPMorganChaseBankMember_7be9e0d5-9368-4553-8532-f49ed2a5dc7a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.matrixservicecompany.com/role/DebtOutstandingBalancesDetails" xlink:type="simple" xlink:href="mtrx-20220630.xsd#DebtOutstandingBalancesDetails"/>
  <link:definitionLink xlink:role="http://www.matrixservicecompany.com/role/DebtOutstandingBalancesDetails" xlink:type="extended" id="ib4acf67836244857a5dc7c4a91872b7c_DebtOutstandingBalancesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_85e8130b-9b07-4251-8dd6-99be094a20c9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityExpirationDate1_eb579454-e070-435a-aaaf-e1720eec7936" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityExpirationDate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_85e8130b-9b07-4251-8dd6-99be094a20c9" xlink:to="loc_us-gaap_LineOfCreditFacilityExpirationDate1_eb579454-e070-435a-aaaf-e1720eec7936" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_9b4a0a06-7f7f-4c41-afa6-2d66a4ed9120" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_85e8130b-9b07-4251-8dd6-99be094a20c9" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_9b4a0a06-7f7f-4c41-afa6-2d66a4ed9120" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncashExpense_65db9875-1aed-49b8-848a-969c34f6e629" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherNoncashExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_85e8130b-9b07-4251-8dd6-99be094a20c9" xlink:to="loc_us-gaap_OtherNoncashExpense_65db9875-1aed-49b8-848a-969c34f6e629" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_2c1a5db9-f09f-4d62-a432-b6b18c8ee8f0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_85e8130b-9b07-4251-8dd6-99be094a20c9" xlink:to="loc_us-gaap_DebtInstrumentTable_2c1a5db9-f09f-4d62-a432-b6b18c8ee8f0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityAxis_890d1ed5-b2b3-468f-bb60-95a42235c0d0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_2c1a5db9-f09f-4d62-a432-b6b18c8ee8f0" xlink:to="loc_us-gaap_LineOfCreditFacilityAxis_890d1ed5-b2b3-468f-bb60-95a42235c0d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLenderDomain_890d1ed5-b2b3-468f-bb60-95a42235c0d0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityLenderDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LineOfCreditFacilityAxis_890d1ed5-b2b3-468f-bb60-95a42235c0d0" xlink:to="loc_us-gaap_LineOfCreditFacilityLenderDomain_890d1ed5-b2b3-468f-bb60-95a42235c0d0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLenderDomain_e30c0256-cd10-4cb3-8d7f-b414b55f039d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityLenderDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LineOfCreditFacilityAxis_890d1ed5-b2b3-468f-bb60-95a42235c0d0" xlink:to="loc_us-gaap_LineOfCreditFacilityLenderDomain_e30c0256-cd10-4cb3-8d7f-b414b55f039d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_JPMorganChaseBankMember_039b8f47-434e-4d59-98c8-f1d87c4f9625" xlink:href="mtrx-20220630.xsd#mtrx_JPMorganChaseBankMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLenderDomain_e30c0256-cd10-4cb3-8d7f-b414b55f039d" xlink:to="loc_mtrx_JPMorganChaseBankMember_039b8f47-434e-4d59-98c8-f1d87c4f9625" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.matrixservicecompany.com/role/AssetBackedDebtProvisionsDetails" xlink:type="simple" xlink:href="mtrx-20220630.xsd#AssetBackedDebtProvisionsDetails"/>
  <link:definitionLink xlink:role="http://www.matrixservicecompany.com/role/AssetBackedDebtProvisionsDetails" xlink:type="extended" id="i20ab53ab56cf46b5a9b3ad49f0544163_AssetBackedDebtProvisionsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_10220bb0-5869-4b62-b4eb-c87e1220b534" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityExpirationDate1_6c56543f-8a88-4445-84bf-2a2235f4fadb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityExpirationDate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_10220bb0-5869-4b62-b4eb-c87e1220b534" xlink:to="loc_us-gaap_LineOfCreditFacilityExpirationDate1_6c56543f-8a88-4445-84bf-2a2235f4fadb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod_ee1991a0-031c-4612-ad8c-96825750dc66" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_10220bb0-5869-4b62-b4eb-c87e1220b534" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod_ee1991a0-031c-4612-ad8c-96825750dc66" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_9481a3d9-b29c-46c0-85ba-70e7b35ef641" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_10220bb0-5869-4b62-b4eb-c87e1220b534" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_9481a3d9-b29c-46c0-85ba-70e7b35ef641" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_f659c938-076b-45f3-93d1-56d73122ea48" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_10220bb0-5869-4b62-b4eb-c87e1220b534" xlink:to="loc_us-gaap_DebtInstrumentTable_f659c938-076b-45f3-93d1-56d73122ea48" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityAxis_3fb6af4c-907f-4a8d-a3e9-f0f8f104364c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_f659c938-076b-45f3-93d1-56d73122ea48" xlink:to="loc_us-gaap_LineOfCreditFacilityAxis_3fb6af4c-907f-4a8d-a3e9-f0f8f104364c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLenderDomain_3fb6af4c-907f-4a8d-a3e9-f0f8f104364c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityLenderDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LineOfCreditFacilityAxis_3fb6af4c-907f-4a8d-a3e9-f0f8f104364c" xlink:to="loc_us-gaap_LineOfCreditFacilityLenderDomain_3fb6af4c-907f-4a8d-a3e9-f0f8f104364c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLenderDomain_6f40c0fa-fbd5-4b96-83e4-ecc4873be75b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityLenderDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LineOfCreditFacilityAxis_3fb6af4c-907f-4a8d-a3e9-f0f8f104364c" xlink:to="loc_us-gaap_LineOfCreditFacilityLenderDomain_6f40c0fa-fbd5-4b96-83e4-ecc4873be75b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_BankOfMontrealMember_d248d2f6-760d-4a4f-9f92-6dedb7f2fac7" xlink:href="mtrx-20220630.xsd#mtrx_BankOfMontrealMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLenderDomain_6f40c0fa-fbd5-4b96-83e4-ecc4873be75b" xlink:to="loc_mtrx_BankOfMontrealMember_d248d2f6-760d-4a4f-9f92-6dedb7f2fac7" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.matrixservicecompany.com/role/IncomeTaxCreditCarryforwardsDetails" xlink:type="simple" xlink:href="mtrx-20220630.xsd#IncomeTaxCreditCarryforwardsDetails"/>
  <link:definitionLink xlink:role="http://www.matrixservicecompany.com/role/IncomeTaxCreditCarryforwardsDetails" xlink:type="extended" id="id0af351f8f0149aeb6b25603f5a91c9a_IncomeTaxCreditCarryforwardsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwardsLineItems_494dca0a-d407-4430-8271-e2e311545fde" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLossCarryforwardsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwardsLimitationsOnUse_0ab8f63e-33fe-4976-a55b-663e6296b0b2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLossCarryforwardsLimitationsOnUse"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_494dca0a-d407-4430-8271-e2e311545fde" xlink:to="loc_us-gaap_OperatingLossCarryforwardsLimitationsOnUse_0ab8f63e-33fe-4976-a55b-663e6296b0b2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwards_5cc19967-84e1-444a-84d5-d8506f0c5134" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLossCarryforwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_494dca0a-d407-4430-8271-e2e311545fde" xlink:to="loc_us-gaap_OperatingLossCarryforwards_5cc19967-84e1-444a-84d5-d8506f0c5134" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxCreditCarryforwardDescription_5a9e9197-b3de-4b6b-8398-7ffaa474c427" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TaxCreditCarryforwardDescription"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_494dca0a-d407-4430-8271-e2e311545fde" xlink:to="loc_us-gaap_TaxCreditCarryforwardDescription_5a9e9197-b3de-4b6b-8398-7ffaa474c427" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxCreditCarryforwardAmount_692e1925-00d1-47d5-a1e6-620a574c64d8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TaxCreditCarryforwardAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_494dca0a-d407-4430-8271-e2e311545fde" xlink:to="loc_us-gaap_TaxCreditCarryforwardAmount_692e1925-00d1-47d5-a1e6-620a574c64d8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwardsTable_9bb0eecf-7c0a-4079-bfe8-b4d3a2682fa6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLossCarryforwardsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_494dca0a-d407-4430-8271-e2e311545fde" xlink:to="loc_us-gaap_OperatingLossCarryforwardsTable_9bb0eecf-7c0a-4079-bfe8-b4d3a2682fa6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_IncomeTaxAuthorityDescriptionAxis_e7bb1735-df40-4187-a158-4c19e3aa78ba" xlink:href="mtrx-20220630.xsd#mtrx_IncomeTaxAuthorityDescriptionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OperatingLossCarryforwardsTable_9bb0eecf-7c0a-4079-bfe8-b4d3a2682fa6" xlink:to="loc_mtrx_IncomeTaxAuthorityDescriptionAxis_e7bb1735-df40-4187-a158-4c19e3aa78ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_IncomeTaxAuthorityDescriptionDomain_e7bb1735-df40-4187-a158-4c19e3aa78ba_default" xlink:href="mtrx-20220630.xsd#mtrx_IncomeTaxAuthorityDescriptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_mtrx_IncomeTaxAuthorityDescriptionAxis_e7bb1735-df40-4187-a158-4c19e3aa78ba" xlink:to="loc_mtrx_IncomeTaxAuthorityDescriptionDomain_e7bb1735-df40-4187-a158-4c19e3aa78ba_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_IncomeTaxAuthorityDescriptionDomain_748d2297-e1cc-48ae-9b30-90e7be3c4cc3" xlink:href="mtrx-20220630.xsd#mtrx_IncomeTaxAuthorityDescriptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_mtrx_IncomeTaxAuthorityDescriptionAxis_e7bb1735-df40-4187-a158-4c19e3aa78ba" xlink:to="loc_mtrx_IncomeTaxAuthorityDescriptionDomain_748d2297-e1cc-48ae-9b30-90e7be3c4cc3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_FederalNetOperatingLossesMember_864ee201-e7f0-47df-bef8-d9ec64908e30" xlink:href="mtrx-20220630.xsd#mtrx_FederalNetOperatingLossesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtrx_IncomeTaxAuthorityDescriptionDomain_748d2297-e1cc-48ae-9b30-90e7be3c4cc3" xlink:to="loc_mtrx_FederalNetOperatingLossesMember_864ee201-e7f0-47df-bef8-d9ec64908e30" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_FederalTaxCreditCarryforwardsMember_0efe8f38-0851-4f7a-9cf7-45a0b3a1b11a" xlink:href="mtrx-20220630.xsd#mtrx_FederalTaxCreditCarryforwardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtrx_IncomeTaxAuthorityDescriptionDomain_748d2297-e1cc-48ae-9b30-90e7be3c4cc3" xlink:to="loc_mtrx_FederalTaxCreditCarryforwardsMember_0efe8f38-0851-4f7a-9cf7-45a0b3a1b11a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_FederalForeignTaxCreditCarryforwardMember_73f70b86-dd75-4d0f-acd3-6cd4caf87db1" xlink:href="mtrx-20220630.xsd#mtrx_FederalForeignTaxCreditCarryforwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtrx_IncomeTaxAuthorityDescriptionDomain_748d2297-e1cc-48ae-9b30-90e7be3c4cc3" xlink:to="loc_mtrx_FederalForeignTaxCreditCarryforwardMember_73f70b86-dd75-4d0f-acd3-6cd4caf87db1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_ForeignTaxCreditCarryforwardsMember_ddb632a4-25d9-448d-8c76-76c32101542e" xlink:href="mtrx-20220630.xsd#mtrx_ForeignTaxCreditCarryforwardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtrx_IncomeTaxAuthorityDescriptionDomain_748d2297-e1cc-48ae-9b30-90e7be3c4cc3" xlink:to="loc_mtrx_ForeignTaxCreditCarryforwardsMember_ddb632a4-25d9-448d-8c76-76c32101542e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StateAndLocalJurisdictionMember_4fd35d04-abe9-47a2-b092-59c47fe45b25" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StateAndLocalJurisdictionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtrx_IncomeTaxAuthorityDescriptionDomain_748d2297-e1cc-48ae-9b30-90e7be3c4cc3" xlink:to="loc_us-gaap_StateAndLocalJurisdictionMember_4fd35d04-abe9-47a2-b092-59c47fe45b25" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_71925b52-c633-464c-96c9-1ddb608204d4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeTaxAuthorityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OperatingLossCarryforwardsTable_9bb0eecf-7c0a-4079-bfe8-b4d3a2682fa6" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_71925b52-c633-464c-96c9-1ddb608204d4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_71925b52-c633-464c-96c9-1ddb608204d4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_71925b52-c633-464c-96c9-1ddb608204d4" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_71925b52-c633-464c-96c9-1ddb608204d4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_2d4693bb-c08a-4dbb-a1cd-e2a31475e6fe" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_71925b52-c633-464c-96c9-1ddb608204d4" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_2d4693bb-c08a-4dbb-a1cd-e2a31475e6fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StateAndLocalJurisdictionMember_0375ab2d-cf9e-4077-bbec-3fcf92a67c9c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StateAndLocalJurisdictionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_2d4693bb-c08a-4dbb-a1cd-e2a31475e6fe" xlink:to="loc_us-gaap_StateAndLocalJurisdictionMember_0375ab2d-cf9e-4077-bbec-3fcf92a67c9c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCountryMember_7c888f83-e515-43ba-884d-5c21f6969703" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ForeignCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_2d4693bb-c08a-4dbb-a1cd-e2a31475e6fe" xlink:to="loc_us-gaap_ForeignCountryMember_7c888f83-e515-43ba-884d-5c21f6969703" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_4dae4f37-4f16-4fef-bc8e-31fbdf022409" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeTaxAuthorityAxis"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_4dae4f37-4f16-4fef-bc8e-31fbdf022409_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_ca878fd0-cfda-4d44-9d93-72634e73cbb8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StateAndLocalJurisdictionMember_6f473874-78b7-4a44-9d26-da71416772e3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StateAndLocalJurisdictionMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCountryMember_31cbf405-29de-4dae-9e46-441f182203cc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ForeignCountryMember"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.matrixservicecompany.com/role/LeasesNarrativeDetails" xlink:type="simple" xlink:href="mtrx-20220630.xsd#LeasesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.matrixservicecompany.com/role/LeasesNarrativeDetails" xlink:type="extended" id="i1a884594d08d40c585b29d2aceb6f528_LeasesNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_16f982e3-8203-4596-82e4-f1a5d6e925e2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseTermOfContract_bd4fd266-de1b-47a4-ae41-a2a25d7856b5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LesseeOperatingLeaseTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_16f982e3-8203-4596-82e4-f1a5d6e925e2" xlink:to="loc_us-gaap_LesseeOperatingLeaseTermOfContract_bd4fd266-de1b-47a4-ae41-a2a25d7856b5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_ac79843d-789d-4ca8-84c9-705a722bf1e2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_16f982e3-8203-4596-82e4-f1a5d6e925e2" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_ac79843d-789d-4ca8-84c9-705a722bf1e2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermAxis_ac079f61-670f-4473-8df3-ccff62748067" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LeaseContractualTermAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_ac79843d-789d-4ca8-84c9-705a722bf1e2" xlink:to="loc_us-gaap_LeaseContractualTermAxis_ac079f61-670f-4473-8df3-ccff62748067" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermDomain_ac079f61-670f-4473-8df3-ccff62748067_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LeaseContractualTermDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LeaseContractualTermAxis_ac079f61-670f-4473-8df3-ccff62748067" xlink:to="loc_us-gaap_LeaseContractualTermDomain_ac079f61-670f-4473-8df3-ccff62748067_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseContractualTermDomain_45175e9f-69a5-43c2-b909-750d674c3b4e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LeaseContractualTermDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LeaseContractualTermAxis_ac079f61-670f-4473-8df3-ccff62748067" xlink:to="loc_us-gaap_LeaseContractualTermDomain_45175e9f-69a5-43c2-b909-750d674c3b4e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_MaximumOperatingLeaseTermMember_752eb780-36d3-4baf-aa49-5698a1efbb65" xlink:href="mtrx-20220630.xsd#mtrx_MaximumOperatingLeaseTermMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeaseContractualTermDomain_45175e9f-69a5-43c2-b909-750d674c3b4e" xlink:to="loc_mtrx_MaximumOperatingLeaseTermMember_752eb780-36d3-4baf-aa49-5698a1efbb65" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.matrixservicecompany.com/role/StockholdersEquityDetailsTextual" xlink:type="simple" xlink:href="mtrx-20220630.xsd#StockholdersEquityDetailsTextual"/>
  <link:definitionLink xlink:role="http://www.matrixservicecompany.com/role/StockholdersEquityDetailsTextual" xlink:type="extended" id="ib0fd5712ffe04e80a9cfb3101313e2b7_StockholdersEquityDetailsTextual">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityClassOfTreasuryStockLineItems_3ed79f16-0da9-419f-8d9d-ecdb15bf835a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityClassOfTreasuryStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramExpirationDate_71349028-543e-4af0-990d-aaa2d3fa2222" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockRepurchaseProgramExpirationDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_3ed79f16-0da9-419f-8d9d-ecdb15bf835a" xlink:to="loc_us-gaap_StockRepurchaseProgramExpirationDate_71349028-543e-4af0-990d-aaa2d3fa2222" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_3eff30a8-687b-4a52-a6fb-7d095c778ea7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_3ed79f16-0da9-419f-8d9d-ecdb15bf835a" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_3eff30a8-687b-4a52-a6fb-7d095c778ea7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_7fbdee52-ef2f-430f-a233-6cd9053cc162" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_3ed79f16-0da9-419f-8d9d-ecdb15bf835a" xlink:to="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_7fbdee52-ef2f-430f-a233-6cd9053cc162" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased_075fc6ef-193e-4b16-8507-2b35431ebfad" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_3ed79f16-0da9-419f-8d9d-ecdb15bf835a" xlink:to="loc_us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased_075fc6ef-193e-4b16-8507-2b35431ebfad" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockShares_29b438b2-3ce9-42ab-9578-b58490815b0d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TreasuryStockShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_3ed79f16-0da9-419f-8d9d-ecdb15bf835a" xlink:to="loc_us-gaap_TreasuryStockShares_29b438b2-3ce9-42ab-9578-b58490815b0d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityDividendRestrictions_f1e71715-1ee8-4acf-9a9f-57c135432389" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityDividendRestrictions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_3ed79f16-0da9-419f-8d9d-ecdb15bf835a" xlink:to="loc_us-gaap_LineOfCreditFacilityDividendRestrictions_f1e71715-1ee8-4acf-9a9f-57c135432389" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased_3796bfba-746e-4768-92e2-c0b39ac7edc8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_3ed79f16-0da9-419f-8d9d-ecdb15bf835a" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased_3796bfba-746e-4768-92e2-c0b39ac7edc8" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_OtherTreasurySharesAcquired_3215ebcc-4544-4b80-b730-462dc90f8da3" xlink:href="mtrx-20220630.xsd#mtrx_OtherTreasurySharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_3ed79f16-0da9-419f-8d9d-ecdb15bf835a" xlink:to="loc_mtrx_OtherTreasurySharesAcquired_3215ebcc-4544-4b80-b730-462dc90f8da3" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_51d134f5-1c60-4df6-b577-75bb0b71e8c5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_3ed79f16-0da9-419f-8d9d-ecdb15bf835a" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_51d134f5-1c60-4df6-b577-75bb0b71e8c5" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfTreasuryStockTable_a2b72f0c-7dd0-4e4a-b584-17dcef7c9b43" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfTreasuryStockTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_3ed79f16-0da9-419f-8d9d-ecdb15bf835a" xlink:to="loc_us-gaap_ClassOfTreasuryStockTable_a2b72f0c-7dd0-4e4a-b584-17dcef7c9b43" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_d1014089-2b04-4f36-b160-f6f48d3c55bc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfTreasuryStockTable_a2b72f0c-7dd0-4e4a-b584-17dcef7c9b43" xlink:to="loc_us-gaap_StatementClassOfStockAxis_d1014089-2b04-4f36-b160-f6f48d3c55bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_d1014089-2b04-4f36-b160-f6f48d3c55bc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_d1014089-2b04-4f36-b160-f6f48d3c55bc" xlink:to="loc_us-gaap_ClassOfStockDomain_d1014089-2b04-4f36-b160-f6f48d3c55bc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_5d1cc7db-fcd0-43eb-8f86-f2b08f13e4fd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_d1014089-2b04-4f36-b160-f6f48d3c55bc" xlink:to="loc_us-gaap_ClassOfStockDomain_5d1cc7db-fcd0-43eb-8f86-f2b08f13e4fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareRepurchaseProgramAxis_fa7b47e5-51c9-4a61-b90f-d912a1f2dd5d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareRepurchaseProgramAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfTreasuryStockTable_a2b72f0c-7dd0-4e4a-b584-17dcef7c9b43" xlink:to="loc_us-gaap_ShareRepurchaseProgramAxis_fa7b47e5-51c9-4a61-b90f-d912a1f2dd5d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareRepurchaseProgramDomain_fa7b47e5-51c9-4a61-b90f-d912a1f2dd5d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShareRepurchaseProgramAxis_fa7b47e5-51c9-4a61-b90f-d912a1f2dd5d" xlink:to="loc_us-gaap_ShareRepurchaseProgramDomain_fa7b47e5-51c9-4a61-b90f-d912a1f2dd5d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareRepurchaseProgramDomain_5cd1bb94-6216-4886-8574-83aa65a83da6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShareRepurchaseProgramAxis_fa7b47e5-51c9-4a61-b90f-d912a1f2dd5d" xlink:to="loc_us-gaap_ShareRepurchaseProgramDomain_5cd1bb94-6216-4886-8574-83aa65a83da6" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.matrixservicecompany.com/role/StockBasedCompensationDetailsTextual" xlink:type="simple" xlink:href="mtrx-20220630.xsd#StockBasedCompensationDetailsTextual"/>
  <link:definitionLink xlink:role="http://www.matrixservicecompany.com/role/StockBasedCompensationDetailsTextual" xlink:type="extended" id="ic51cd764a4054e50a4085746f7cd1254_StockBasedCompensationDetailsTextual">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c6a44ef9-c19b-438e-913c-458ef1d65a82" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_e9a88822-e355-4ac3-804d-5071c699cd63" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c6a44ef9-c19b-438e-913c-458ef1d65a82" xlink:to="loc_us-gaap_ShareBasedCompensation_e9a88822-e355-4ac3-804d-5071c699cd63" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_592cf67a-a3a6-4a2b-90e6-2834da38d642" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c6a44ef9-c19b-438e-913c-458ef1d65a82" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_592cf67a-a3a6-4a2b-90e6-2834da38d642" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_83f879d7-ea91-445b-a380-2f204edcec98" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c6a44ef9-c19b-438e-913c-458ef1d65a82" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_83f879d7-ea91-445b-a380-2f204edcec98" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount_3dbd3486-28a4-41e5-a2da-bd29910456be" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c6a44ef9-c19b-438e-913c-458ef1d65a82" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount_3dbd3486-28a4-41e5-a2da-bd29910456be" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_2c5a378c-4ab7-42ac-8386-d8aec3b404a3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c6a44ef9-c19b-438e-913c-458ef1d65a82" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_2c5a378c-4ab7-42ac-8386-d8aec3b404a3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_09f9eebe-07b8-4e4c-ae75-3ba08ffec7d8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c6a44ef9-c19b-438e-913c-458ef1d65a82" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_09f9eebe-07b8-4e4c-ae75-3ba08ffec7d8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_cb13c6eb-bfb2-402b-bb7a-4cf033632e2f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c6a44ef9-c19b-438e-913c-458ef1d65a82" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_cb13c6eb-bfb2-402b-bb7a-4cf033632e2f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_24db2466-066c-4081-bb39-6bd0fb949c38" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c6a44ef9-c19b-438e-913c-458ef1d65a82" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_24db2466-066c-4081-bb39-6bd0fb949c38" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_46037aef-10e6-4cba-980e-458af6a60361" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c6a44ef9-c19b-438e-913c-458ef1d65a82" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_46037aef-10e6-4cba-980e-458af6a60361" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardInstallmentPeriodForVesting_2ad9af05-9e92-4a65-b511-47749a4339b1" xlink:href="mtrx-20220630.xsd#mtrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardInstallmentPeriodForVesting"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c6a44ef9-c19b-438e-913c-458ef1d65a82" xlink:to="loc_mtrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardInstallmentPeriodForVesting_2ad9af05-9e92-4a65-b511-47749a4339b1" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_Vestingperiodretirementeligibleemployees_c8187f9f-ebd4-4415-91c2-bfd6bf882fd6" xlink:href="mtrx-20220630.xsd#mtrx_Vestingperiodretirementeligibleemployees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c6a44ef9-c19b-438e-913c-458ef1d65a82" xlink:to="loc_mtrx_Vestingperiodretirementeligibleemployees_c8187f9f-ebd4-4415-91c2-bfd6bf882fd6" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodOfDirectorAwards_1d68ff26-41ef-4796-a290-e653a55fc064" xlink:href="mtrx-20220630.xsd#mtrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodOfDirectorAwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c6a44ef9-c19b-438e-913c-458ef1d65a82" xlink:to="loc_mtrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriodOfDirectorAwards_1d68ff26-41ef-4796-a290-e653a55fc064" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardDescriptionofVestingPeriodofDirectorAwards_0f0d54ef-f636-4a11-a861-b6dd20db1885" xlink:href="mtrx-20220630.xsd#mtrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardDescriptionofVestingPeriodofDirectorAwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c6a44ef9-c19b-438e-913c-458ef1d65a82" xlink:to="loc_mtrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardDescriptionofVestingPeriodofDirectorAwards_0f0d54ef-f636-4a11-a861-b6dd20db1885" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_PayoutAsPercentageOfOriginalAwardMinimum_728a6fcd-dfef-47f9-8132-63cc05ec4b29" xlink:href="mtrx-20220630.xsd#mtrx_PayoutAsPercentageOfOriginalAwardMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c6a44ef9-c19b-438e-913c-458ef1d65a82" xlink:to="loc_mtrx_PayoutAsPercentageOfOriginalAwardMinimum_728a6fcd-dfef-47f9-8132-63cc05ec4b29" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_PayoutAsPercentageOfOriginalAwardMaximum_c50b8acf-3497-49f7-b5be-346d97ee5831" xlink:href="mtrx-20220630.xsd#mtrx_PayoutAsPercentageOfOriginalAwardMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c6a44ef9-c19b-438e-913c-458ef1d65a82" xlink:to="loc_mtrx_PayoutAsPercentageOfOriginalAwardMaximum_c50b8acf-3497-49f7-b5be-346d97ee5831" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_MinimumThresholdSharesScheduledToVestForPerformanceBasedShares_3942bab5-324f-4127-97eb-f6a51032a302" xlink:href="mtrx-20220630.xsd#mtrx_MinimumThresholdSharesScheduledToVestForPerformanceBasedShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c6a44ef9-c19b-438e-913c-458ef1d65a82" xlink:to="loc_mtrx_MinimumThresholdSharesScheduledToVestForPerformanceBasedShares_3942bab5-324f-4127-97eb-f6a51032a302" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsMethodUsed_56a82dae-43fb-4bf1-a5ac-5948560351cd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsMethodUsed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c6a44ef9-c19b-438e-913c-458ef1d65a82" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsMethodUsed_56a82dae-43fb-4bf1-a5ac-5948560351cd" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueMethodNumberofSimulationsUsed_1b9f56fa-671a-4839-9aec-c0c0271edc7f" xlink:href="mtrx-20220630.xsd#mtrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueMethodNumberofSimulationsUsed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c6a44ef9-c19b-438e-913c-458ef1d65a82" xlink:to="loc_mtrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueMethodNumberofSimulationsUsed_1b9f56fa-671a-4839-9aec-c0c0271edc7f" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardDeferredGrantsInPeriod_6014d422-deb3-40a4-88b6-89eea79ddffd" xlink:href="mtrx-20220630.xsd#mtrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardDeferredGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c6a44ef9-c19b-438e-913c-458ef1d65a82" xlink:to="loc_mtrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardDeferredGrantsInPeriod_6014d422-deb3-40a4-88b6-89eea79ddffd" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardDeferredWeightedAverageGrantDateFairValue_fd165405-bf51-43ec-99c4-ee60b67e9ca0" xlink:href="mtrx-20220630.xsd#mtrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardDeferredWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c6a44ef9-c19b-438e-913c-458ef1d65a82" xlink:to="loc_mtrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardDeferredWeightedAverageGrantDateFairValue_fd165405-bf51-43ec-99c4-ee60b67e9ca0" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardDeferredSharesVestedAndReleased_9cc2079f-48c1-42b2-8068-cb2d57635e79" xlink:href="mtrx-20220630.xsd#mtrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardDeferredSharesVestedAndReleased"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c6a44ef9-c19b-438e-913c-458ef1d65a82" xlink:to="loc_mtrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardDeferredSharesVestedAndReleased_9cc2079f-48c1-42b2-8068-cb2d57635e79" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardDeferredSharesVestedAndReleasedWeightedAverageGrantDateFairValue_ed3a97c5-5602-4940-9909-1132e993df3f" xlink:href="mtrx-20220630.xsd#mtrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardDeferredSharesVestedAndReleasedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c6a44ef9-c19b-438e-913c-458ef1d65a82" xlink:to="loc_mtrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardDeferredSharesVestedAndReleasedWeightedAverageGrantDateFairValue_ed3a97c5-5602-4940-9909-1132e993df3f" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_45610290-c850-4b3f-a5c0-1d549f0293e8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c6a44ef9-c19b-438e-913c-458ef1d65a82" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_45610290-c850-4b3f-a5c0-1d549f0293e8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_93151144-2cc6-4168-9357-237b69a95568" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_45610290-c850-4b3f-a5c0-1d549f0293e8" xlink:to="loc_us-gaap_PlanNameAxis_93151144-2cc6-4168-9357-237b69a95568" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_93151144-2cc6-4168-9357-237b69a95568_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_93151144-2cc6-4168-9357-237b69a95568" xlink:to="loc_us-gaap_PlanNameDomain_93151144-2cc6-4168-9357-237b69a95568_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_ef5da0f1-6bcb-4c7d-aea2-2f38453c338e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_93151144-2cc6-4168-9357-237b69a95568" xlink:to="loc_us-gaap_PlanNameDomain_ef5da0f1-6bcb-4c7d-aea2-2f38453c338e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_MatrixServiceCompanys2004StockandIncentiveCompensationPlanMember_daf73947-ff54-4b5b-9ffb-6059b609fdbb" xlink:href="mtrx-20220630.xsd#mtrx_MatrixServiceCompanys2004StockandIncentiveCompensationPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_ef5da0f1-6bcb-4c7d-aea2-2f38453c338e" xlink:to="loc_mtrx_MatrixServiceCompanys2004StockandIncentiveCompensationPlanMember_daf73947-ff54-4b5b-9ffb-6059b609fdbb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_MatrixServiceCompanys2012StockandIncentiveCompensationPlanMember_6a01c3de-1174-41d9-b935-b717721835c8" xlink:href="mtrx-20220630.xsd#mtrx_MatrixServiceCompanys2012StockandIncentiveCompensationPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_ef5da0f1-6bcb-4c7d-aea2-2f38453c338e" xlink:to="loc_mtrx_MatrixServiceCompanys2012StockandIncentiveCompensationPlanMember_6a01c3de-1174-41d9-b935-b717721835c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_MatrixServiceCompany2016StockandIncentiveCompensationPlanMember_a6249482-a6b8-41f1-9067-31d9c1ef9745" xlink:href="mtrx-20220630.xsd#mtrx_MatrixServiceCompany2016StockandIncentiveCompensationPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_ef5da0f1-6bcb-4c7d-aea2-2f38453c338e" xlink:to="loc_mtrx_MatrixServiceCompany2016StockandIncentiveCompensationPlanMember_a6249482-a6b8-41f1-9067-31d9c1ef9745" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_e9a3cdb5-0037-4fd5-8965-2d3790f9e758" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_45610290-c850-4b3f-a5c0-1d549f0293e8" xlink:to="loc_us-gaap_AwardTypeAxis_e9a3cdb5-0037-4fd5-8965-2d3790f9e758" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e9a3cdb5-0037-4fd5-8965-2d3790f9e758_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_e9a3cdb5-0037-4fd5-8965-2d3790f9e758" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e9a3cdb5-0037-4fd5-8965-2d3790f9e758_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e4e0c4c8-7c06-4c6e-9a5d-d1469c3d614c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_e9a3cdb5-0037-4fd5-8965-2d3790f9e758" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e4e0c4c8-7c06-4c6e-9a5d-d1469c3d614c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_MarketBasedAwardsMember_5ac56c0f-a391-4629-a81c-fd33d4dfe183" xlink:href="mtrx-20220630.xsd#mtrx_MarketBasedAwardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e4e0c4c8-7c06-4c6e-9a5d-d1469c3d614c" xlink:to="loc_mtrx_MarketBasedAwardsMember_5ac56c0f-a391-4629-a81c-fd33d4dfe183" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_VestIn2021Member_c1fd90b8-771b-44ee-a24a-db6bca16fe4f" xlink:href="mtrx-20220630.xsd#mtrx_VestIn2021Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e4e0c4c8-7c06-4c6e-9a5d-d1469c3d614c" xlink:to="loc_mtrx_VestIn2021Member_c1fd90b8-771b-44ee-a24a-db6bca16fe4f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_VestIn2022Member_f7aaa1e6-4ea6-43ef-9996-51cf60d0984b" xlink:href="mtrx-20220630.xsd#mtrx_VestIn2022Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e4e0c4c8-7c06-4c6e-9a5d-d1469c3d614c" xlink:to="loc_mtrx_VestIn2022Member_f7aaa1e6-4ea6-43ef-9996-51cf60d0984b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_VestIn2023Member_6781279b-3be8-4235-aff7-7bb80a950858" xlink:href="mtrx-20220630.xsd#mtrx_VestIn2023Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e4e0c4c8-7c06-4c6e-9a5d-d1469c3d614c" xlink:to="loc_mtrx_VestIn2023Member_6781279b-3be8-4235-aff7-7bb80a950858" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis_3a544006-80e6-4dad-a3e1-930545eb756e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_45610290-c850-4b3f-a5c0-1d549f0293e8" xlink:to="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis_3a544006-80e6-4dad-a3e1-930545eb756e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityBasedArrangementsIndividualContractsTypeOfDeferredCompensationDomain_3a544006-80e6-4dad-a3e1-930545eb756e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityBasedArrangementsIndividualContractsTypeOfDeferredCompensationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis_3a544006-80e6-4dad-a3e1-930545eb756e" xlink:to="loc_us-gaap_EquityBasedArrangementsIndividualContractsTypeOfDeferredCompensationDomain_3a544006-80e6-4dad-a3e1-930545eb756e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityBasedArrangementsIndividualContractsTypeOfDeferredCompensationDomain_18289184-b3bf-4481-bfd7-6d9f433b2153" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityBasedArrangementsIndividualContractsTypeOfDeferredCompensationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis_3a544006-80e6-4dad-a3e1-930545eb756e" xlink:to="loc_us-gaap_EquityBasedArrangementsIndividualContractsTypeOfDeferredCompensationDomain_18289184-b3bf-4481-bfd7-6d9f433b2153" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_EmployeeAwardMember_0fe4d546-dc40-4728-aea2-a77d4c959b6c" xlink:href="mtrx-20220630.xsd#mtrx_EmployeeAwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityBasedArrangementsIndividualContractsTypeOfDeferredCompensationDomain_18289184-b3bf-4481-bfd7-6d9f433b2153" xlink:to="loc_mtrx_EmployeeAwardMember_0fe4d546-dc40-4728-aea2-a77d4c959b6c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_DirectorAwardsMember_04d40496-ae06-46ae-ad25-3537d91c4cc8" xlink:href="mtrx-20220630.xsd#mtrx_DirectorAwardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityBasedArrangementsIndividualContractsTypeOfDeferredCompensationDomain_18289184-b3bf-4481-bfd7-6d9f433b2153" xlink:to="loc_mtrx_DirectorAwardsMember_04d40496-ae06-46ae-ad25-3537d91c4cc8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_d69283f8-5aca-4dc1-821d-2c295378a6c6" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_45610290-c850-4b3f-a5c0-1d549f0293e8" xlink:to="loc_srt_RangeAxis_d69283f8-5aca-4dc1-821d-2c295378a6c6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_d69283f8-5aca-4dc1-821d-2c295378a6c6_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_d69283f8-5aca-4dc1-821d-2c295378a6c6" xlink:to="loc_srt_RangeMember_d69283f8-5aca-4dc1-821d-2c295378a6c6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_edcbf8ac-a449-413b-b5ba-3ff81d89dbf2" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_d69283f8-5aca-4dc1-821d-2c295378a6c6" xlink:to="loc_srt_RangeMember_edcbf8ac-a449-413b-b5ba-3ff81d89dbf2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_1830e65e-080b-4a03-ace3-1f306a87ca3c" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_edcbf8ac-a449-413b-b5ba-3ff81d89dbf2" xlink:to="loc_srt_MinimumMember_1830e65e-080b-4a03-ace3-1f306a87ca3c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_c47d7de5-92cd-4e9e-82bf-c426e56da9ed" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_edcbf8ac-a449-413b-b5ba-3ff81d89dbf2" xlink:to="loc_srt_MaximumMember_c47d7de5-92cd-4e9e-82bf-c426e56da9ed" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.matrixservicecompany.com/role/StockBasedCompensationRestrictedStockUnitsDetails" xlink:type="simple" xlink:href="mtrx-20220630.xsd#StockBasedCompensationRestrictedStockUnitsDetails"/>
  <link:definitionLink xlink:role="http://www.matrixservicecompany.com/role/StockBasedCompensationRestrictedStockUnitsDetails" xlink:type="extended" id="i56bc14634f7f4d17a4581479d475d9ef_StockBasedCompensationRestrictedStockUnitsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_8e7dc7ae-7711-4dbb-be22-89a6575b5245" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_9cfd7865-a890-4d0d-acaf-50b7b2228da9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_8e7dc7ae-7711-4dbb-be22-89a6575b5245" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_9cfd7865-a890-4d0d-acaf-50b7b2228da9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_02ac544c-e334-4947-9345-81795c48e177" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_8e7dc7ae-7711-4dbb-be22-89a6575b5245" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_02ac544c-e334-4947-9345-81795c48e177" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_ec3baba0-34b1-4bc9-a4a6-e40f9008a6c4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_8e7dc7ae-7711-4dbb-be22-89a6575b5245" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_ec3baba0-34b1-4bc9-a4a6-e40f9008a6c4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_e5d166c7-5f53-470c-a45d-9c809947b0c5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_8e7dc7ae-7711-4dbb-be22-89a6575b5245" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_e5d166c7-5f53-470c-a45d-9c809947b0c5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockAwardForfeitures_651696bf-eb70-4a11-8e95-12eafcd753a9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestrictedStockAwardForfeitures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_8e7dc7ae-7711-4dbb-be22-89a6575b5245" xlink:to="loc_us-gaap_RestrictedStockAwardForfeitures_651696bf-eb70-4a11-8e95-12eafcd753a9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c7bb5e9a-39e8-47ab-9c1b-7ca7de57b9cb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_8e7dc7ae-7711-4dbb-be22-89a6575b5245" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c7bb5e9a-39e8-47ab-9c1b-7ca7de57b9cb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_b88bdc4e-19fa-4348-8ddb-5fb7e834971d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c7bb5e9a-39e8-47ab-9c1b-7ca7de57b9cb" xlink:to="loc_us-gaap_AwardTypeAxis_b88bdc4e-19fa-4348-8ddb-5fb7e834971d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b88bdc4e-19fa-4348-8ddb-5fb7e834971d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_b88bdc4e-19fa-4348-8ddb-5fb7e834971d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b88bdc4e-19fa-4348-8ddb-5fb7e834971d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ae08331b-3902-4f2b-adc5-5547ddffeab3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_b88bdc4e-19fa-4348-8ddb-5fb7e834971d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ae08331b-3902-4f2b-adc5-5547ddffeab3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_CashPerformanceAwardsMember_5b33eeb8-2b23-4a14-b54e-3f080b5bafe9" xlink:href="mtrx-20220630.xsd#mtrx_CashPerformanceAwardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ae08331b-3902-4f2b-adc5-5547ddffeab3" xlink:to="loc_mtrx_CashPerformanceAwardsMember_5b33eeb8-2b23-4a14-b54e-3f080b5bafe9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_ShareBasedPerformanceAwardsMember_89ab718b-e261-474c-8df3-447f12ceef13" xlink:href="mtrx-20220630.xsd#mtrx_ShareBasedPerformanceAwardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ae08331b-3902-4f2b-adc5-5547ddffeab3" xlink:to="loc_mtrx_ShareBasedPerformanceAwardsMember_89ab718b-e261-474c-8df3-447f12ceef13" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.matrixservicecompany.com/role/EarningsperCommonShareDetails1" xlink:type="simple" xlink:href="mtrx-20220630.xsd#EarningsperCommonShareDetails1"/>
  <link:definitionLink xlink:role="http://www.matrixservicecompany.com/role/EarningsperCommonShareDetails1" xlink:type="extended" id="id6611d517abf4b9cb35aae550ff1cfe4_EarningsperCommonShareDetails1">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_d86776c0-2000-4043-9fa0-a1d45a3dee1b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_AntidilutiveSecuritiesExcludedFromComputationOfDilutedEarningsPerShareAbstract_7d8b3a4b-f2db-4645-b267-26a26b926220" xlink:href="mtrx-20220630.xsd#mtrx_AntidilutiveSecuritiesExcludedFromComputationOfDilutedEarningsPerShareAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_d86776c0-2000-4043-9fa0-a1d45a3dee1b" xlink:to="loc_mtrx_AntidilutiveSecuritiesExcludedFromComputationOfDilutedEarningsPerShareAbstract_7d8b3a4b-f2db-4645-b267-26a26b926220" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_788f2467-bcd8-4f02-b777-50c576308108" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtrx_AntidilutiveSecuritiesExcludedFromComputationOfDilutedEarningsPerShareAbstract_7d8b3a4b-f2db-4645-b267-26a26b926220" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_788f2467-bcd8-4f02-b777-50c576308108" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_9e654a56-d70d-4c67-aabf-02c8568a09b5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_d86776c0-2000-4043-9fa0-a1d45a3dee1b" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_9e654a56-d70d-4c67-aabf-02c8568a09b5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_219ee46e-51f1-430f-a30b-6b9cb7b0468a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_9e654a56-d70d-4c67-aabf-02c8568a09b5" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_219ee46e-51f1-430f-a30b-6b9cb7b0468a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_219ee46e-51f1-430f-a30b-6b9cb7b0468a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_219ee46e-51f1-430f-a30b-6b9cb7b0468a" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_219ee46e-51f1-430f-a30b-6b9cb7b0468a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_91f7c498-eb9e-4529-bfec-ef23cbb334b8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_219ee46e-51f1-430f-a30b-6b9cb7b0468a" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_91f7c498-eb9e-4529-bfec-ef23cbb334b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_ca1d8570-1d9a-4d56-879c-37c2724d6244" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_91f7c498-eb9e-4529-bfec-ef23cbb334b8" xlink:to="loc_us-gaap_EmployeeStockOptionMember_ca1d8570-1d9a-4d56-879c-37c2724d6244" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_NonvestedDeferredSharesMember_34614d23-ea24-405e-9172-3004487595f9" xlink:href="mtrx-20220630.xsd#mtrx_NonvestedDeferredSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_91f7c498-eb9e-4529-bfec-ef23cbb334b8" xlink:to="loc_mtrx_NonvestedDeferredSharesMember_34614d23-ea24-405e-9172-3004487595f9" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.matrixservicecompany.com/role/EmployeeBenefitPlansDetailsTextual" xlink:type="simple" xlink:href="mtrx-20220630.xsd#EmployeeBenefitPlansDetailsTextual"/>
  <link:definitionLink xlink:role="http://www.matrixservicecompany.com/role/EmployeeBenefitPlansDetailsTextual" xlink:type="extended" id="i6b83865e372f476f9a374caaa7c498f6_EmployeeBenefitPlansDetailsTextual">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MultiemployerPlansLineItems_d16562c1-d6d0-4277-8b18-00024fa42c98" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MultiemployerPlansLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_NumberOfUnionsContributedTo_3a2d078f-0a34-4797-ba56-0e5a617c105a" xlink:href="mtrx-20220630.xsd#mtrx_NumberOfUnionsContributedTo"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MultiemployerPlansLineItems_d16562c1-d6d0-4277-8b18-00024fa42c98" xlink:to="loc_mtrx_NumberOfUnionsContributedTo_3a2d078f-0a34-4797-ba56-0e5a617c105a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_PercentageOfPlanFunded_c7defacf-f566-4eca-a106-4aa8a0d89276" xlink:href="mtrx-20220630.xsd#mtrx_PercentageOfPlanFunded"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MultiemployerPlansLineItems_d16562c1-d6d0-4277-8b18-00024fa42c98" xlink:to="loc_mtrx_PercentageOfPlanFunded_c7defacf-f566-4eca-a106-4aa8a0d89276" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_DescriptionOfFundedPortionOfPlan_58346ef0-ee98-4db1-9058-f3e9b6afd024" xlink:href="mtrx-20220630.xsd#mtrx_DescriptionOfFundedPortionOfPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MultiemployerPlansLineItems_d16562c1-d6d0-4277-8b18-00024fa42c98" xlink:to="loc_mtrx_DescriptionOfFundedPortionOfPlan_58346ef0-ee98-4db1-9058-f3e9b6afd024" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfMultiemployerPlansTable_9e52ec41-134a-46cd-bebd-5050b78e358b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfMultiemployerPlansTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_MultiemployerPlansLineItems_d16562c1-d6d0-4277-8b18-00024fa42c98" xlink:to="loc_us-gaap_ScheduleOfMultiemployerPlansTable_9e52ec41-134a-46cd-bebd-5050b78e358b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_943f8d7f-ba16-429b-bd5f-1fb8fded5527" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfMultiemployerPlansTable_9e52ec41-134a-46cd-bebd-5050b78e358b" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_943f8d7f-ba16-429b-bd5f-1fb8fded5527" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_943f8d7f-ba16-429b-bd5f-1fb8fded5527_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_943f8d7f-ba16-429b-bd5f-1fb8fded5527" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_943f8d7f-ba16-429b-bd5f-1fb8fded5527_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_03a2574c-2be0-4c54-b2ba-30df6e0ad530" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_943f8d7f-ba16-429b-bd5f-1fb8fded5527" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_03a2574c-2be0-4c54-b2ba-30df6e0ad530" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_PlumbersandPipefittersLocalUnionSevenFourPensionFundMember_652b8fbb-1ee6-4f58-ae09-732fa086be75" xlink:href="mtrx-20220630.xsd#mtrx_PlumbersandPipefittersLocalUnionSevenFourPensionFundMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_03a2574c-2be0-4c54-b2ba-30df6e0ad530" xlink:to="loc_mtrx_PlumbersandPipefittersLocalUnionSevenFourPensionFundMember_652b8fbb-1ee6-4f58-ae09-732fa086be75" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_MultiemployerPlanZoneByTypeAxis_6ff27d70-2835-4b37-a3e1-61642e43999d" xlink:href="mtrx-20220630.xsd#mtrx_MultiemployerPlanZoneByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfMultiemployerPlansTable_9e52ec41-134a-46cd-bebd-5050b78e358b" xlink:to="loc_mtrx_MultiemployerPlanZoneByTypeAxis_6ff27d70-2835-4b37-a3e1-61642e43999d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_MultiemployerPlanZoneByTypeDomain_6ff27d70-2835-4b37-a3e1-61642e43999d_default" xlink:href="mtrx-20220630.xsd#mtrx_MultiemployerPlanZoneByTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_mtrx_MultiemployerPlanZoneByTypeAxis_6ff27d70-2835-4b37-a3e1-61642e43999d" xlink:to="loc_mtrx_MultiemployerPlanZoneByTypeDomain_6ff27d70-2835-4b37-a3e1-61642e43999d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_MultiemployerPlanZoneByTypeDomain_f5e966bd-9e13-43b4-a6df-85434506155c" xlink:href="mtrx-20220630.xsd#mtrx_MultiemployerPlanZoneByTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_mtrx_MultiemployerPlanZoneByTypeAxis_6ff27d70-2835-4b37-a3e1-61642e43999d" xlink:to="loc_mtrx_MultiemployerPlanZoneByTypeDomain_f5e966bd-9e13-43b4-a6df-85434506155c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_ZoneRedMember_b4825904-9f0b-4e92-90ff-d3b53a81acd7" xlink:href="mtrx-20220630.xsd#mtrx_ZoneRedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtrx_MultiemployerPlanZoneByTypeDomain_f5e966bd-9e13-43b4-a6df-85434506155c" xlink:to="loc_mtrx_ZoneRedMember_b4825904-9f0b-4e92-90ff-d3b53a81acd7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_ZoneYellowMember_1c206bf0-6976-4eea-9d94-5efa1dad71fa" xlink:href="mtrx-20220630.xsd#mtrx_ZoneYellowMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtrx_MultiemployerPlanZoneByTypeDomain_f5e966bd-9e13-43b4-a6df-85434506155c" xlink:to="loc_mtrx_ZoneYellowMember_1c206bf0-6976-4eea-9d94-5efa1dad71fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_ZoneGreenMember_01f681c7-2d78-45e9-92d1-df4ee665d531" xlink:href="mtrx-20220630.xsd#mtrx_ZoneGreenMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_mtrx_MultiemployerPlanZoneByTypeDomain_f5e966bd-9e13-43b4-a6df-85434506155c" xlink:to="loc_mtrx_ZoneGreenMember_01f681c7-2d78-45e9-92d1-df4ee665d531" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.matrixservicecompany.com/role/EmployeeBenefitPlansDetails" xlink:type="simple" xlink:href="mtrx-20220630.xsd#EmployeeBenefitPlansDetails"/>
  <link:definitionLink xlink:role="http://www.matrixservicecompany.com/role/EmployeeBenefitPlansDetails" xlink:type="extended" id="iaeb33a6c83d4469eba671499fac93b25_EmployeeBenefitPlansDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MultiemployerPlansLineItems_fb330902-44ab-4f0b-bf59-0689d7c0f37f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MultiemployerPlansLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_MultiemployerPlansNumber_44e61a7a-6df6-4fc2-aa21-cd2773a64dc3" xlink:href="mtrx-20220630.xsd#mtrx_MultiemployerPlansNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MultiemployerPlansLineItems_fb330902-44ab-4f0b-bf59-0689d7c0f37f" xlink:to="loc_mtrx_MultiemployerPlansNumber_44e61a7a-6df6-4fc2-aa21-cd2773a64dc3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MultiemployerPlansUnderfundedStatusDescription_3c399a41-b27b-4054-af1f-6fabb8e62541" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MultiemployerPlansUnderfundedStatusDescription"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MultiemployerPlansLineItems_fb330902-44ab-4f0b-bf59-0689d7c0f37f" xlink:to="loc_us-gaap_MultiemployerPlansUnderfundedStatusDescription_3c399a41-b27b-4054-af1f-6fabb8e62541" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MultiemployerPlanPensionSignificantFundingImprovementOrRehabilitationPlanImplementationStatusFixedList_e1e0beae-982c-4f12-ae32-86ef4855405d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MultiemployerPlanPensionSignificantFundingImprovementOrRehabilitationPlanImplementationStatusFixedList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MultiemployerPlansLineItems_fb330902-44ab-4f0b-bf59-0689d7c0f37f" xlink:to="loc_us-gaap_MultiemployerPlanPensionSignificantFundingImprovementOrRehabilitationPlanImplementationStatusFixedList_e1e0beae-982c-4f12-ae32-86ef4855405d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MultiemployerPlanPensionSignificantEmployerContributionCost_1b631d66-72ce-4648-b9e6-335c906acc8d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MultiemployerPlanPensionSignificantEmployerContributionCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MultiemployerPlansLineItems_fb330902-44ab-4f0b-bf59-0689d7c0f37f" xlink:to="loc_us-gaap_MultiemployerPlanPensionSignificantEmployerContributionCost_1b631d66-72ce-4648-b9e6-335c906acc8d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MultiemployerPlanPensionInsignificantEmployerContributionCost_5a5e1c39-733f-46be-9697-60a08345ff95" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MultiemployerPlanPensionInsignificantEmployerContributionCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MultiemployerPlansLineItems_fb330902-44ab-4f0b-bf59-0689d7c0f37f" xlink:to="loc_us-gaap_MultiemployerPlanPensionInsignificantEmployerContributionCost_5a5e1c39-733f-46be-9697-60a08345ff95" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MultiemployerPlanEmployerContributionCost_6156d02b-888a-4717-9803-d5c2c4ebf46f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MultiemployerPlanEmployerContributionCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MultiemployerPlansLineItems_fb330902-44ab-4f0b-bf59-0689d7c0f37f" xlink:to="loc_us-gaap_MultiemployerPlanEmployerContributionCost_6156d02b-888a-4717-9803-d5c2c4ebf46f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MultiemployerPlanPensionSignificantSurchargeFixedList_9bf9ecce-8c9f-402a-b13b-c7d21ce70d1a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MultiemployerPlanPensionSignificantSurchargeFixedList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MultiemployerPlansLineItems_fb330902-44ab-4f0b-bf59-0689d7c0f37f" xlink:to="loc_us-gaap_MultiemployerPlanPensionSignificantSurchargeFixedList_9bf9ecce-8c9f-402a-b13b-c7d21ce70d1a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MultiemployerPlanPensionSignificantCollectiveBargainingArrangementExpirationDate_6005ed4a-f384-4dad-9264-6f0d695088ac" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MultiemployerPlanPensionSignificantCollectiveBargainingArrangementExpirationDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MultiemployerPlansLineItems_fb330902-44ab-4f0b-bf59-0689d7c0f37f" xlink:to="loc_us-gaap_MultiemployerPlanPensionSignificantCollectiveBargainingArrangementExpirationDate_6005ed4a-f384-4dad-9264-6f0d695088ac" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MultiemployerPlansCollectiveBargainingArrangementExpirationDateDescription_1a6d43be-1459-4326-aeff-bb307696ea9f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MultiemployerPlansCollectiveBargainingArrangementExpirationDateDescription"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MultiemployerPlansLineItems_fb330902-44ab-4f0b-bf59-0689d7c0f37f" xlink:to="loc_us-gaap_MultiemployerPlansCollectiveBargainingArrangementExpirationDateDescription_1a6d43be-1459-4326-aeff-bb307696ea9f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfMultiemployerPlansTable_71fa3f5a-ee46-435a-85fc-dba12d196a07" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfMultiemployerPlansTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_MultiemployerPlansLineItems_fb330902-44ab-4f0b-bf59-0689d7c0f37f" xlink:to="loc_us-gaap_ScheduleOfMultiemployerPlansTable_71fa3f5a-ee46-435a-85fc-dba12d196a07" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_aa77a019-3c1e-4938-8b0a-cb3f45bceb32" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfMultiemployerPlansTable_71fa3f5a-ee46-435a-85fc-dba12d196a07" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_aa77a019-3c1e-4938-8b0a-cb3f45bceb32" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_aa77a019-3c1e-4938-8b0a-cb3f45bceb32_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_aa77a019-3c1e-4938-8b0a-cb3f45bceb32" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_aa77a019-3c1e-4938-8b0a-cb3f45bceb32_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_27270beb-9c3c-4321-8973-cf8acfb0b71b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_aa77a019-3c1e-4938-8b0a-cb3f45bceb32" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_27270beb-9c3c-4321-8973-cf8acfb0b71b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_BoilermakerBlacksmithNationalPensionTrustMember_d4abf8ea-a645-49b7-9768-a3e66672e20b" xlink:href="mtrx-20220630.xsd#mtrx_BoilermakerBlacksmithNationalPensionTrustMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_27270beb-9c3c-4321-8973-cf8acfb0b71b" xlink:to="loc_mtrx_BoilermakerBlacksmithNationalPensionTrustMember_d4abf8ea-a645-49b7-9768-a3e66672e20b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_NationalElectricalBenefitFundLocal488And126Member_578fcc2f-7637-4638-b05a-883f9b16e174" xlink:href="mtrx-20220630.xsd#mtrx_NationalElectricalBenefitFundLocal488And126Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_27270beb-9c3c-4321-8973-cf8acfb0b71b" xlink:to="loc_mtrx_NationalElectricalBenefitFundLocal488And126Member_578fcc2f-7637-4638-b05a-883f9b16e174" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_JointPensionFundLocalUnionOneSixFourIbewMember_0eeee3f1-6659-44da-aaba-c65a77acbdb1" xlink:href="mtrx-20220630.xsd#mtrx_JointPensionFundLocalUnionOneSixFourIbewMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_27270beb-9c3c-4321-8973-cf8acfb0b71b" xlink:to="loc_mtrx_JointPensionFundLocalUnionOneSixFourIbewMember_0eeee3f1-6659-44da-aaba-c65a77acbdb1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_JointPensionFundLocalUnionNumberOneZeroTwoMemberDomain_c73e95c2-01d2-405b-b1ff-36e3aa737336" xlink:href="mtrx-20220630.xsd#mtrx_JointPensionFundLocalUnionNumberOneZeroTwoMemberDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_27270beb-9c3c-4321-8973-cf8acfb0b71b" xlink:to="loc_mtrx_JointPensionFundLocalUnionNumberOneZeroTwoMemberDomain_c73e95c2-01d2-405b-b1ff-36e3aa737336" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_IBEWLocalFourFiveSixPensionPlanMemberDomain_7348ea6a-87dd-4d14-b187-e630bac15cd2" xlink:href="mtrx-20220630.xsd#mtrx_IBEWLocalFourFiveSixPensionPlanMemberDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_27270beb-9c3c-4321-8973-cf8acfb0b71b" xlink:to="loc_mtrx_IBEWLocalFourFiveSixPensionPlanMemberDomain_7348ea6a-87dd-4d14-b187-e630bac15cd2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_LocalThreeFiveOneIbewPensionPlanDomain_57096a67-a200-4fea-95fb-64a0c6d505eb" xlink:href="mtrx-20220630.xsd#mtrx_LocalThreeFiveOneIbewPensionPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_27270beb-9c3c-4321-8973-cf8acfb0b71b" xlink:to="loc_mtrx_LocalThreeFiveOneIbewPensionPlanDomain_57096a67-a200-4fea-95fb-64a0c6d505eb" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_SteamfittersLocalUnionNumberFourTwoZeroPensionPlanMemberDomain_76632c6b-a11a-465e-82a4-8e29fe54cd82" xlink:href="mtrx-20220630.xsd#mtrx_SteamfittersLocalUnionNumberFourTwoZeroPensionPlanMemberDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_27270beb-9c3c-4321-8973-cf8acfb0b71b" xlink:to="loc_mtrx_SteamfittersLocalUnionNumberFourTwoZeroPensionPlanMemberDomain_76632c6b-a11a-465e-82a4-8e29fe54cd82" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_IBEWLocal654PensionPlanMember_032e008d-4503-44bf-9f54-9ed796aa4099" xlink:href="mtrx-20220630.xsd#mtrx_IBEWLocal654PensionPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_27270beb-9c3c-4321-8973-cf8acfb0b71b" xlink:to="loc_mtrx_IBEWLocal654PensionPlanMember_032e008d-4503-44bf-9f54-9ed796aa4099" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_OhioCarpentersPensionFundLocal1090and351Member_11c1a33c-8b17-473e-b916-47200e3ccf61" xlink:href="mtrx-20220630.xsd#mtrx_OhioCarpentersPensionFundLocal1090and351Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_27270beb-9c3c-4321-8973-cf8acfb0b71b" xlink:to="loc_mtrx_OhioCarpentersPensionFundLocal1090and351Member_11c1a33c-8b17-473e-b916-47200e3ccf61" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_IronWorkersPensionPlanLoc.55Member_7d431aa9-a673-47f9-8310-e6eaecd302d3" xlink:href="mtrx-20220630.xsd#mtrx_IronWorkersPensionPlanLoc.55Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_27270beb-9c3c-4321-8973-cf8acfb0b71b" xlink:to="loc_mtrx_IronWorkersPensionPlanLoc.55Member_7d431aa9-a673-47f9-8310-e6eaecd302d3" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_NorthwesternOhioPlumbersAndPipeFittersLocal50Member_e219c71b-9c1d-425f-b5fb-cd19095b8fd4" xlink:href="mtrx-20220630.xsd#mtrx_NorthwesternOhioPlumbersAndPipeFittersLocal50Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_27270beb-9c3c-4321-8973-cf8acfb0b71b" xlink:to="loc_mtrx_NorthwesternOhioPlumbersAndPipeFittersLocal50Member_e219c71b-9c1d-425f-b5fb-cd19095b8fd4" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_IBEWLocalUnionNineEightPensionPlanMember_ad0b9802-7e37-4706-871b-01bdcc3ef155" xlink:href="mtrx-20220630.xsd#mtrx_IBEWLocalUnionNineEightPensionPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_27270beb-9c3c-4321-8973-cf8acfb0b71b" xlink:to="loc_mtrx_IBEWLocalUnionNineEightPensionPlanMember_ad0b9802-7e37-4706-871b-01bdcc3ef155" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_IndianaLaborersPensionFundDomain_a6132657-81c9-4e4a-9383-c0227e980bc9" xlink:href="mtrx-20220630.xsd#mtrx_IndianaLaborersPensionFundDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_27270beb-9c3c-4321-8973-cf8acfb0b71b" xlink:to="loc_mtrx_IndianaLaborersPensionFundDomain_a6132657-81c9-4e4a-9383-c0227e980bc9" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_IronworkersMidAmericaPensionPlanMember_d43a8ea3-79b4-4b33-a467-05274612f11b" xlink:href="mtrx-20220630.xsd#mtrx_IronworkersMidAmericaPensionPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_27270beb-9c3c-4321-8973-cf8acfb0b71b" xlink:to="loc_mtrx_IronworkersMidAmericaPensionPlanMember_d43a8ea3-79b4-4b33-a467-05274612f11b" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_PipefittersRetirementFundLocalFiveNineSevenMember_0f024c80-f68d-4e1e-b8a4-136dc7682a87" xlink:href="mtrx-20220630.xsd#mtrx_PipefittersRetirementFundLocalFiveNineSevenMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_27270beb-9c3c-4321-8973-cf8acfb0b71b" xlink:to="loc_mtrx_PipefittersRetirementFundLocalFiveNineSevenMember_0f024c80-f68d-4e1e-b8a4-136dc7682a87" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_IronWorkersPensionPlanofWesternPennsylvaniaLocal3Member_20038762-1bb4-487c-8352-cf7419d6827c" xlink:href="mtrx-20220630.xsd#mtrx_IronWorkersPensionPlanofWesternPennsylvaniaLocal3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_27270beb-9c3c-4321-8973-cf8acfb0b71b" xlink:to="loc_mtrx_IronWorkersPensionPlanofWesternPennsylvaniaLocal3Member_20038762-1bb4-487c-8352-cf7419d6827c" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_ConnecticutPlumbersandPipefittersPensionFundLocal777Member_67793f60-52da-4dc5-92a9-3881c6545f34" xlink:href="mtrx-20220630.xsd#mtrx_ConnecticutPlumbersandPipefittersPensionFundLocal777Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_27270beb-9c3c-4321-8973-cf8acfb0b71b" xlink:to="loc_mtrx_ConnecticutPlumbersandPipefittersPensionFundLocal777Member_67793f60-52da-4dc5-92a9-3881c6545f34" xlink:type="arc" order="16"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.matrixservicecompany.com/role/SegmentInformationDetails" xlink:type="simple" xlink:href="mtrx-20220630.xsd#SegmentInformationDetails"/>
  <link:definitionLink xlink:role="http://www.matrixservicecompany.com/role/SegmentInformationDetails" xlink:type="extended" id="i382bad33ff52496a9bbcaca205b2d9f9_SegmentInformationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_e9757283-201c-4deb-9aa6-831a8317a5a4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationProfitLossAbstract_a5402aeb-2c84-435c-8881-ba037db238d8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentReportingInformationProfitLossAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_e9757283-201c-4deb-9aa6-831a8317a5a4" xlink:to="loc_us-gaap_SegmentReportingInformationProfitLossAbstract_a5402aeb-2c84-435c-8881-ba037db238d8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_Grossrevenues_8b66e3f9-2a58-44ac-b972-72c2dc6a59d6" xlink:href="mtrx-20220630.xsd#mtrx_Grossrevenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationProfitLossAbstract_a5402aeb-2c84-435c-8881-ba037db238d8" xlink:to="loc_mtrx_Grossrevenues_8b66e3f9-2a58-44ac-b972-72c2dc6a59d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_8025fe2d-4a2a-4297-ace8-8fb3ec645d04" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationProfitLossAbstract_a5402aeb-2c84-435c-8881-ba037db238d8" xlink:to="loc_us-gaap_Revenues_8025fe2d-4a2a-4297-ace8-8fb3ec645d04" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_2743c0e4-fa5d-4656-9bb7-5d4fe6cbba0e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GrossProfit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationProfitLossAbstract_a5402aeb-2c84-435c-8881-ba037db238d8" xlink:to="loc_us-gaap_GrossProfit_2743c0e4-fa5d-4656-9bb7-5d4fe6cbba0e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_360b5834-9a91-4b8e-900e-e7422822a9e9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationProfitLossAbstract_a5402aeb-2c84-435c-8881-ba037db238d8" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_360b5834-9a91-4b8e-900e-e7422822a9e9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringSettlementAndImpairmentProvisions_a2e51d90-ce0d-43ae-b2a3-061c52f5752e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestructuringSettlementAndImpairmentProvisions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationProfitLossAbstract_a5402aeb-2c84-435c-8881-ba037db238d8" xlink:to="loc_us-gaap_RestructuringSettlementAndImpairmentProvisions_a2e51d90-ce0d-43ae-b2a3-061c52f5752e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_87f600a9-e8b5-4585-95f6-ace318efeced" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationProfitLossAbstract_a5402aeb-2c84-435c-8881-ba037db238d8" xlink:to="loc_us-gaap_OperatingIncomeLoss_87f600a9-e8b5-4585-95f6-ace318efeced" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_d059fccf-9869-4369-94a4-b2e15ccc2084" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationProfitLossAbstract_a5402aeb-2c84-435c-8881-ba037db238d8" xlink:to="loc_us-gaap_Assets_d059fccf-9869-4369-94a4-b2e15ccc2084" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_da713ce7-76fe-4658-a6f4-7935239b60bb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationProfitLossAbstract_a5402aeb-2c84-435c-8881-ba037db238d8" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_da713ce7-76fe-4658-a6f4-7935239b60bb" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_02896d0b-45ce-4a49-a689-615a04203e92" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationProfitLossAbstract_a5402aeb-2c84-435c-8881-ba037db238d8" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_02896d0b-45ce-4a49-a689-615a04203e92" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_61544bac-76a6-4e25-beb4-76e662d317a4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_e9757283-201c-4deb-9aa6-831a8317a5a4" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_61544bac-76a6-4e25-beb4-76e662d317a4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_58f375c5-f501-44d3-a45d-a813e4c3f934" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_61544bac-76a6-4e25-beb4-76e662d317a4" xlink:to="loc_srt_ConsolidationItemsAxis_58f375c5-f501-44d3-a45d-a813e4c3f934" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_58f375c5-f501-44d3-a45d-a813e4c3f934_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_58f375c5-f501-44d3-a45d-a813e4c3f934" xlink:to="loc_srt_ConsolidationItemsDomain_58f375c5-f501-44d3-a45d-a813e4c3f934_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_01d5de2e-ce98-4815-80c8-41250fb872fc" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_58f375c5-f501-44d3-a45d-a813e4c3f934" xlink:to="loc_srt_ConsolidationItemsDomain_01d5de2e-ce98-4815-80c8-41250fb872fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_3bfc0156-18ad-47ba-8f4b-4c4db2b62dc6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_01d5de2e-ce98-4815-80c8-41250fb872fc" xlink:to="loc_us-gaap_OperatingSegmentsMember_3bfc0156-18ad-47ba-8f4b-4c4db2b62dc6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntersegmentEliminationMember_afaa817a-2f8f-4987-a65a-5454c59a40fe" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IntersegmentEliminationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_01d5de2e-ce98-4815-80c8-41250fb872fc" xlink:to="loc_us-gaap_IntersegmentEliminationMember_afaa817a-2f8f-4987-a65a-5454c59a40fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_6499a233-3225-49fd-a3cc-01af5e713de6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_61544bac-76a6-4e25-beb4-76e662d317a4" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_6499a233-3225-49fd-a3cc-01af5e713de6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_6499a233-3225-49fd-a3cc-01af5e713de6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_6499a233-3225-49fd-a3cc-01af5e713de6" xlink:to="loc_us-gaap_SegmentDomain_6499a233-3225-49fd-a3cc-01af5e713de6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_cef0cf1b-c37a-466b-a415-0703b83d71fb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_6499a233-3225-49fd-a3cc-01af5e713de6" xlink:to="loc_us-gaap_SegmentDomain_cef0cf1b-c37a-466b-a415-0703b83d71fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_UtilityAndPowerInfrastructureSegmentMember_aeea7f04-7470-4b1a-9f34-0710321251cf" xlink:href="mtrx-20220630.xsd#mtrx_UtilityAndPowerInfrastructureSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_cef0cf1b-c37a-466b-a415-0703b83d71fb" xlink:to="loc_mtrx_UtilityAndPowerInfrastructureSegmentMember_aeea7f04-7470-4b1a-9f34-0710321251cf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_ProcessAndIndustrialFacilitiesSegmentMember_3d7d5756-40b0-42f2-ab19-d9b665d5d181" xlink:href="mtrx-20220630.xsd#mtrx_ProcessAndIndustrialFacilitiesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_cef0cf1b-c37a-466b-a415-0703b83d71fb" xlink:to="loc_mtrx_ProcessAndIndustrialFacilitiesSegmentMember_3d7d5756-40b0-42f2-ab19-d9b665d5d181" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_StorageAndTerminalSolutionsSegmentMember_b5000f9f-52ff-4448-9961-5f9ba33165f3" xlink:href="mtrx-20220630.xsd#mtrx_StorageAndTerminalSolutionsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_cef0cf1b-c37a-466b-a415-0703b83d71fb" xlink:to="loc_mtrx_StorageAndTerminalSolutionsSegmentMember_b5000f9f-52ff-4448-9961-5f9ba33165f3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_UnallocatedCorporateCostsMember_c8ba68c8-25ab-4972-b06b-6c3c72c52582" xlink:href="mtrx-20220630.xsd#mtrx_UnallocatedCorporateCostsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_cef0cf1b-c37a-466b-a415-0703b83d71fb" xlink:to="loc_mtrx_UnallocatedCorporateCostsMember_c8ba68c8-25ab-4972-b06b-6c3c72c52582" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.matrixservicecompany.com/role/SegmentInformationDetails2" xlink:type="simple" xlink:href="mtrx-20220630.xsd#SegmentInformationDetails2"/>
  <link:definitionLink xlink:role="http://www.matrixservicecompany.com/role/SegmentInformationDetails2" xlink:type="extended" id="ifa3e186377d946dbb162e2d148307352_SegmentInformationDetails2">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_2b72c08b-38d9-4464-9f8d-b3633e5ec084" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EntityWideRevenueMajorCustomerLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_ac5a71c3-dd51-45cc-8143-0c41857eb01a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_2b72c08b-38d9-4464-9f8d-b3633e5ec084" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_ac5a71c3-dd51-45cc-8143-0c41857eb01a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_7dd82f81-a988-4390-b8ab-112dba3db431" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EntityWideRevenueMajorCustomerLineItems_2b72c08b-38d9-4464-9f8d-b3633e5ec084" xlink:to="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_7dd82f81-a988-4390-b8ab-112dba3db431" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_2f90e891-e1f9-4cf2-988a-9d9c8f8e94e2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_7dd82f81-a988-4390-b8ab-112dba3db431" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_2f90e891-e1f9-4cf2-988a-9d9c8f8e94e2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_2f90e891-e1f9-4cf2-988a-9d9c8f8e94e2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_2f90e891-e1f9-4cf2-988a-9d9c8f8e94e2" xlink:to="loc_us-gaap_SegmentDomain_2f90e891-e1f9-4cf2-988a-9d9c8f8e94e2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_e987333c-5078-4337-acd3-778bb604263a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_2f90e891-e1f9-4cf2-988a-9d9c8f8e94e2" xlink:to="loc_us-gaap_SegmentDomain_e987333c-5078-4337-acd3-778bb604263a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_UtilityAndPowerInfrastructureSegmentMember_07db237d-957e-4ca5-acbc-de63f665cd35" xlink:href="mtrx-20220630.xsd#mtrx_UtilityAndPowerInfrastructureSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_e987333c-5078-4337-acd3-778bb604263a" xlink:to="loc_mtrx_UtilityAndPowerInfrastructureSegmentMember_07db237d-957e-4ca5-acbc-de63f665cd35" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_ProcessAndIndustrialFacilitiesSegmentMember_7b810b81-9b54-4e70-b11b-5e084d95f97f" xlink:href="mtrx-20220630.xsd#mtrx_ProcessAndIndustrialFacilitiesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_e987333c-5078-4337-acd3-778bb604263a" xlink:to="loc_mtrx_ProcessAndIndustrialFacilitiesSegmentMember_7b810b81-9b54-4e70-b11b-5e084d95f97f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_StorageAndTerminalSolutionsSegmentMember_5d376cc2-ee1a-49a8-862e-e10414e4a59d" xlink:href="mtrx-20220630.xsd#mtrx_StorageAndTerminalSolutionsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_e987333c-5078-4337-acd3-778bb604263a" xlink:to="loc_mtrx_StorageAndTerminalSolutionsSegmentMember_5d376cc2-ee1a-49a8-862e-e10414e4a59d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_5a3afa69-4a80-451b-9bcb-6d5b2d70e767" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_7dd82f81-a988-4390-b8ab-112dba3db431" xlink:to="loc_srt_MajorCustomersAxis_5a3afa69-4a80-451b-9bcb-6d5b2d70e767" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_5a3afa69-4a80-451b-9bcb-6d5b2d70e767_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_5a3afa69-4a80-451b-9bcb-6d5b2d70e767" xlink:to="loc_srt_NameOfMajorCustomerDomain_5a3afa69-4a80-451b-9bcb-6d5b2d70e767_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_57b27568-f773-4c12-9fc0-a7a43f155b16" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_5a3afa69-4a80-451b-9bcb-6d5b2d70e767" xlink:to="loc_srt_NameOfMajorCustomerDomain_57b27568-f773-4c12-9fc0-a7a43f155b16" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_CustomerOneMember_fb7d1682-ec46-482d-b169-2a8f99947bf6" xlink:href="mtrx-20220630.xsd#mtrx_CustomerOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_57b27568-f773-4c12-9fc0-a7a43f155b16" xlink:to="loc_mtrx_CustomerOneMember_fb7d1682-ec46-482d-b169-2a8f99947bf6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_CustomerTwoMember_6bab2b05-1e87-420e-bcf8-98cac9e1f504" xlink:href="mtrx-20220630.xsd#mtrx_CustomerTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_57b27568-f773-4c12-9fc0-a7a43f155b16" xlink:to="loc_mtrx_CustomerTwoMember_6bab2b05-1e87-420e-bcf8-98cac9e1f504" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_CustomerThreeMember_0470d801-5b0e-4293-bcba-07e9aed3ddeb" xlink:href="mtrx-20220630.xsd#mtrx_CustomerThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_57b27568-f773-4c12-9fc0-a7a43f155b16" xlink:to="loc_mtrx_CustomerThreeMember_0470d801-5b0e-4293-bcba-07e9aed3ddeb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_CustomerFourMember_768610c1-14d2-4bac-b278-b34e84b65791" xlink:href="mtrx-20220630.xsd#mtrx_CustomerFourMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_57b27568-f773-4c12-9fc0-a7a43f155b16" xlink:to="loc_mtrx_CustomerFourMember_768610c1-14d2-4bac-b278-b34e84b65791" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_CustomerFiveMemberMember_01a2896d-1c42-4235-aeb7-6fbff19e4ef7" xlink:href="mtrx-20220630.xsd#mtrx_CustomerFiveMemberMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_57b27568-f773-4c12-9fc0-a7a43f155b16" xlink:to="loc_mtrx_CustomerFiveMemberMember_01a2896d-1c42-4235-aeb7-6fbff19e4ef7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_CustomerSixMember_bba3e77c-379b-40e6-b6e4-67541d687cdf" xlink:href="mtrx-20220630.xsd#mtrx_CustomerSixMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_57b27568-f773-4c12-9fc0-a7a43f155b16" xlink:to="loc_mtrx_CustomerSixMember_bba3e77c-379b-40e6-b6e4-67541d687cdf" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_CustomerSevenMember_bcaa5ed7-8e23-4b7f-974c-52f7065fd18c" xlink:href="mtrx-20220630.xsd#mtrx_CustomerSevenMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_57b27568-f773-4c12-9fc0-a7a43f155b16" xlink:to="loc_mtrx_CustomerSevenMember_bcaa5ed7-8e23-4b7f-974c-52f7065fd18c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_CustomerEightMember_c74235b1-f7ad-484a-be58-911d7107baa9" xlink:href="mtrx-20220630.xsd#mtrx_CustomerEightMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_57b27568-f773-4c12-9fc0-a7a43f155b16" xlink:to="loc_mtrx_CustomerEightMember_c74235b1-f7ad-484a-be58-911d7107baa9" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_CustomerNineMember_84641353-670a-4e69-b9a4-52a813634c9e" xlink:href="mtrx-20220630.xsd#mtrx_CustomerNineMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_57b27568-f773-4c12-9fc0-a7a43f155b16" xlink:to="loc_mtrx_CustomerNineMember_84641353-670a-4e69-b9a4-52a813634c9e" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_CustomerTenMember_70d3e690-fdec-4bc0-8bfc-2b0bc9392dba" xlink:href="mtrx-20220630.xsd#mtrx_CustomerTenMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_57b27568-f773-4c12-9fc0-a7a43f155b16" xlink:to="loc_mtrx_CustomerTenMember_70d3e690-fdec-4bc0-8bfc-2b0bc9392dba" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_CustomerElevenMember_52e343d4-14b1-449e-b6ab-f694498a6032" xlink:href="mtrx-20220630.xsd#mtrx_CustomerElevenMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_57b27568-f773-4c12-9fc0-a7a43f155b16" xlink:to="loc_mtrx_CustomerElevenMember_52e343d4-14b1-449e-b6ab-f694498a6032" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_CustomerTwelveMember_d218d887-471d-4e85-bfff-42e09816d9fd" xlink:href="mtrx-20220630.xsd#mtrx_CustomerTwelveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_57b27568-f773-4c12-9fc0-a7a43f155b16" xlink:to="loc_mtrx_CustomerTwelveMember_d218d887-471d-4e85-bfff-42e09816d9fd" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_CustomerThirteenMember_33729a44-2919-4445-bd24-3b2ebdf9519e" xlink:href="mtrx-20220630.xsd#mtrx_CustomerThirteenMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_57b27568-f773-4c12-9fc0-a7a43f155b16" xlink:to="loc_mtrx_CustomerThirteenMember_33729a44-2919-4445-bd24-3b2ebdf9519e" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_f22aab51-79f4-413f-b90f-0a5477a7755b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_7dd82f81-a988-4390-b8ab-112dba3db431" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_f22aab51-79f4-413f-b90f-0a5477a7755b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_f22aab51-79f4-413f-b90f-0a5477a7755b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_f22aab51-79f4-413f-b90f-0a5477a7755b" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_f22aab51-79f4-413f-b90f-0a5477a7755b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_c713b31c-815b-4d2f-a5f3-181190b8fd8f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_f22aab51-79f4-413f-b90f-0a5477a7755b" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_c713b31c-815b-4d2f-a5f3-181190b8fd8f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_6939971f-9ab8-4967-95e8-2d940b1ef007" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CustomerConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_c713b31c-815b-4d2f-a5f3-181190b8fd8f" xlink:to="loc_us-gaap_CustomerConcentrationRiskMember_6939971f-9ab8-4967-95e8-2d940b1ef007" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_a62a0877-2d56-402d-8ab7-dcf7455024ce" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_7dd82f81-a988-4390-b8ab-112dba3db431" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_a62a0877-2d56-402d-8ab7-dcf7455024ce" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_a62a0877-2d56-402d-8ab7-dcf7455024ce_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_a62a0877-2d56-402d-8ab7-dcf7455024ce" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_a62a0877-2d56-402d-8ab7-dcf7455024ce_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_e763dcc4-3ac5-473b-9d58-10ac9a188ae5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_a62a0877-2d56-402d-8ab7-dcf7455024ce" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_e763dcc4-3ac5-473b-9d58-10ac9a188ae5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesRevenueNetMember_befa818f-a205-4108-acf0-eb6a3ee1052a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SalesRevenueNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_e763dcc4-3ac5-473b-9d58-10ac9a188ae5" xlink:to="loc_us-gaap_SalesRevenueNetMember_befa818f-a205-4108-acf0-eb6a3ee1052a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.matrixservicecompany.com/role/RestructuringCostsDetails" xlink:type="simple" xlink:href="mtrx-20220630.xsd#RestructuringCostsDetails"/>
  <link:definitionLink xlink:role="http://www.matrixservicecompany.com/role/RestructuringCostsDetails" xlink:type="extended" id="ie7332a625e1545fb84920e69542bbdc5_RestructuringCostsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_d66407ae-428b-4a36-ab8d-f088ee2cb61d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeveranceCosts1_a7901208-7672-41d9-9f79-de6270831d9e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SeveranceCosts1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_d66407ae-428b-4a36-ab8d-f088ee2cb61d" xlink:to="loc_us-gaap_SeveranceCosts1_a7901208-7672-41d9-9f79-de6270831d9e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessExitCosts1_6685b400-a95a-4e6f-8303-a173082a0c87" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessExitCosts1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_d66407ae-428b-4a36-ab8d-f088ee2cb61d" xlink:to="loc_us-gaap_BusinessExitCosts1_6685b400-a95a-4e6f-8303-a173082a0c87" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill_e13ac5ca-64e4-41c4-9ce4-a84d22695b4f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_d66407ae-428b-4a36-ab8d-f088ee2cb61d" xlink:to="loc_us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill_e13ac5ca-64e4-41c4-9ce4-a84d22695b4f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherRestructuringCosts_d900e835-fe12-46f1-99e2-1c0e6afa0d71" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherRestructuringCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_d66407ae-428b-4a36-ab8d-f088ee2cb61d" xlink:to="loc_us-gaap_OtherRestructuringCosts_d900e835-fe12-46f1-99e2-1c0e6afa0d71" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_429c674e-42cb-4866-9140-52dbea80be43" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_d66407ae-428b-4a36-ab8d-f088ee2cb61d" xlink:to="loc_us-gaap_RestructuringCharges_429c674e-42cb-4866-9140-52dbea80be43" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_26eda33d-0504-4435-b52d-0d38fb3072e2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestructuringReserve"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_d66407ae-428b-4a36-ab8d-f088ee2cb61d" xlink:to="loc_us-gaap_RestructuringReserve_26eda33d-0504-4435-b52d-0d38fb3072e2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_CurrentYearOutstandingRestructuringCostsIncurred_8ddb08f3-7cfe-44c1-b3f0-4b4a704b1879" xlink:href="mtrx-20220630.xsd#mtrx_CurrentYearOutstandingRestructuringCostsIncurred"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_d66407ae-428b-4a36-ab8d-f088ee2cb61d" xlink:to="loc_mtrx_CurrentYearOutstandingRestructuringCostsIncurred_8ddb08f3-7cfe-44c1-b3f0-4b4a704b1879" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRestructuring_05a8f95f-857e-4604-aaea-592d1fbe7c89" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsForRestructuring"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_d66407ae-428b-4a36-ab8d-f088ee2cb61d" xlink:to="loc_us-gaap_PaymentsForRestructuring_05a8f95f-857e-4604-aaea-592d1fbe7c89" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_AdjustmentToRestructuringReserve_2b283dd2-6658-49d0-88bc-31e88ebc57c2" xlink:href="mtrx-20220630.xsd#mtrx_AdjustmentToRestructuringReserve"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_d66407ae-428b-4a36-ab8d-f088ee2cb61d" xlink:to="loc_mtrx_AdjustmentToRestructuringReserve_2b283dd2-6658-49d0-88bc-31e88ebc57c2" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_241a7e94-e0b5-4d88-a402-28e65f1176f8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_d66407ae-428b-4a36-ab8d-f088ee2cb61d" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_241a7e94-e0b5-4d88-a402-28e65f1176f8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_9627ee7d-4b7b-42f4-b03e-83f8d94842bb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_241a7e94-e0b5-4d88-a402-28e65f1176f8" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_9627ee7d-4b7b-42f4-b03e-83f8d94842bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_9627ee7d-4b7b-42f4-b03e-83f8d94842bb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_9627ee7d-4b7b-42f4-b03e-83f8d94842bb" xlink:to="loc_us-gaap_SegmentDomain_9627ee7d-4b7b-42f4-b03e-83f8d94842bb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_dd570ae3-2894-4413-b589-4428f211b855" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_9627ee7d-4b7b-42f4-b03e-83f8d94842bb" xlink:to="loc_us-gaap_SegmentDomain_dd570ae3-2894-4413-b589-4428f211b855" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_UtilityAndPowerInfrastructureSegmentMember_37fa7bf3-ca13-41a0-8537-2fad22c65d07" xlink:href="mtrx-20220630.xsd#mtrx_UtilityAndPowerInfrastructureSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_dd570ae3-2894-4413-b589-4428f211b855" xlink:to="loc_mtrx_UtilityAndPowerInfrastructureSegmentMember_37fa7bf3-ca13-41a0-8537-2fad22c65d07" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_ProcessAndIndustrialFacilitiesSegmentMember_29543b8b-eab2-4d3d-91b8-07573de90707" xlink:href="mtrx-20220630.xsd#mtrx_ProcessAndIndustrialFacilitiesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_dd570ae3-2894-4413-b589-4428f211b855" xlink:to="loc_mtrx_ProcessAndIndustrialFacilitiesSegmentMember_29543b8b-eab2-4d3d-91b8-07573de90707" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_StorageAndTerminalSolutionsSegmentMember_7a5a4dff-bb71-4a2b-8bbf-df92c38f145b" xlink:href="mtrx-20220630.xsd#mtrx_StorageAndTerminalSolutionsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_dd570ae3-2894-4413-b589-4428f211b855" xlink:to="loc_mtrx_StorageAndTerminalSolutionsSegmentMember_7a5a4dff-bb71-4a2b-8bbf-df92c38f145b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_UnallocatedCorporateCostsMember_f76a5d81-bfb5-4388-9a5c-f39e40a6f470" xlink:href="mtrx-20220630.xsd#mtrx_UnallocatedCorporateCostsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_dd570ae3-2894-4413-b589-4428f211b855" xlink:to="loc_mtrx_UnallocatedCorporateCostsMember_f76a5d81-bfb5-4388-9a5c-f39e40a6f470" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.matrixservicecompany.com/role/ValuationandQualifyingAccountsDetails" xlink:type="simple" xlink:href="mtrx-20220630.xsd#ValuationandQualifyingAccountsDetails"/>
  <link:definitionLink xlink:role="http://www.matrixservicecompany.com/role/ValuationandQualifyingAccountsDetails" xlink:type="extended" id="i834a93ae79fd4c2f8910a79388eea5a1_ValuationandQualifyingAccountsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_ad422656-51e6-458e-803f-e36f15afa481" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ValuationAndQualifyingAccountsDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_5643ef66-59aa-4b65-a67f-823c665d54d7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MovementInValuationAllowancesAndReservesRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_ad422656-51e6-458e-803f-e36f15afa481" xlink:to="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_5643ef66-59aa-4b65-a67f-823c665d54d7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesBalance_80c433e4-26b6-4506-a86a-1926bf06f233" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationAllowancesAndReservesBalance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_5643ef66-59aa-4b65-a67f-823c665d54d7" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesBalance_80c433e4-26b6-4506-a86a-1926bf06f233" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_a1f73770-3e96-412b-8a83-86022d247281" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_5643ef66-59aa-4b65-a67f-823c665d54d7" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_a1f73770-3e96-412b-8a83-86022d247281" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts_0266b764-5b1d-4fce-b308-2cfc822ac67a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_5643ef66-59aa-4b65-a67f-823c665d54d7" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts_0266b764-5b1d-4fce-b308-2cfc822ac67a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDeductions_570a3eff-83eb-41ad-95bd-e48bc512220e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationAllowancesAndReservesDeductions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_5643ef66-59aa-4b65-a67f-823c665d54d7" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDeductions_570a3eff-83eb-41ad-95bd-e48bc512220e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesBalance_234a5326-15cc-4329-a163-751964cb80f4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationAllowancesAndReservesBalance"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ValuationAndQualifyingAccountsDisclosureTable_a2b14c34-976c-4d7b-9c52-9a5d8c425e8a" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ValuationAndQualifyingAccountsDisclosureTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_ad422656-51e6-458e-803f-e36f15afa481" xlink:to="loc_srt_ValuationAndQualifyingAccountsDisclosureTable_a2b14c34-976c-4d7b-9c52-9a5d8c425e8a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_f825316f-0a9d-49e0-a8cf-d1cbe5ea6ca6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationAllowancesAndReservesTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureTable_a2b14c34-976c-4d7b-9c52-9a5d8c425e8a" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_f825316f-0a9d-49e0-a8cf-d1cbe5ea6ca6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDomain_f825316f-0a9d-49e0-a8cf-d1cbe5ea6ca6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationAllowancesAndReservesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_f825316f-0a9d-49e0-a8cf-d1cbe5ea6ca6" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDomain_f825316f-0a9d-49e0-a8cf-d1cbe5ea6ca6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDomain_c102ac2a-2497-431e-b92a-80a5ed61f31f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationAllowancesAndReservesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_f825316f-0a9d-49e0-a8cf-d1cbe5ea6ca6" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDomain_c102ac2a-2497-431e-b92a-80a5ed61f31f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForCreditLossMember_57a87d29-2096-460c-a133-a2a0553fceaa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AllowanceForCreditLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesDomain_c102ac2a-2497-431e-b92a-80a5ed61f31f" xlink:to="loc_us-gaap_AllowanceForCreditLossMember_57a87d29-2096-460c-a133-a2a0553fceaa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember_c8e5f98e-93de-4173-b028-1c7a7f0c9013" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesDomain_c102ac2a-2497-431e-b92a-80a5ed61f31f" xlink:to="loc_us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember_c8e5f98e-93de-4173-b028-1c7a7f0c9013" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_ValuationAllowanceOfDeferredTaxAssetsForeignCurrencyTranslationDeduction_fc1cfe47-e159-44fa-89f4-4cf68dbbc87e" xlink:href="mtrx-20220630.xsd#mtrx_ValuationAllowanceOfDeferredTaxAssetsForeignCurrencyTranslationDeduction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesDomain_c102ac2a-2497-431e-b92a-80a5ed61f31f" xlink:to="loc_mtrx_ValuationAllowanceOfDeferredTaxAssetsForeignCurrencyTranslationDeduction_fc1cfe47-e159-44fa-89f4-4cf68dbbc87e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_ValuationAllowanceOfDeferredTaxAssetsFullyReservedTaxCredits_ebda5b24-0a38-4090-859b-3384d6414df8" xlink:href="mtrx-20220630.xsd#mtrx_ValuationAllowanceOfDeferredTaxAssetsFullyReservedTaxCredits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesDomain_c102ac2a-2497-431e-b92a-80a5ed61f31f" xlink:to="loc_mtrx_ValuationAllowanceOfDeferredTaxAssetsFullyReservedTaxCredits_ebda5b24-0a38-4090-859b-3384d6414df8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_AccountsReceivableReserveIncrease_f7e29047-73d7-4200-9eca-809f4e67d2cf" xlink:href="mtrx-20220630.xsd#mtrx_AccountsReceivableReserveIncrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesDomain_c102ac2a-2497-431e-b92a-80a5ed61f31f" xlink:to="loc_mtrx_AccountsReceivableReserveIncrease_f7e29047-73d7-4200-9eca-809f4e67d2cf" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_AccountsReceivableReserveRecovery_991c9150-2cf9-4ea3-9763-979e8f773551" xlink:href="mtrx-20220630.xsd#mtrx_AccountsReceivableReserveRecovery"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesDomain_c102ac2a-2497-431e-b92a-80a5ed61f31f" xlink:to="loc_mtrx_AccountsReceivableReserveRecovery_991c9150-2cf9-4ea3-9763-979e8f773551" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_AccountsReceivableReserveWriteOffOfFullyReservedBalance_6af33646-25b8-44ba-8195-ab3feb1a302e" xlink:href="mtrx-20220630.xsd#mtrx_AccountsReceivableReserveWriteOffOfFullyReservedBalance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesDomain_c102ac2a-2497-431e-b92a-80a5ed61f31f" xlink:to="loc_mtrx_AccountsReceivableReserveWriteOffOfFullyReservedBalance_6af33646-25b8-44ba-8195-ab3feb1a302e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_ValuationAllowanceOfDeferredTaxAssetsShareBasedPaymentAwardsCompensationDeduction_b55bf095-2984-42c8-835a-0a2c2b2019c3" xlink:href="mtrx-20220630.xsd#mtrx_ValuationAllowanceOfDeferredTaxAssetsShareBasedPaymentAwardsCompensationDeduction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesDomain_c102ac2a-2497-431e-b92a-80a5ed61f31f" xlink:to="loc_mtrx_ValuationAllowanceOfDeferredTaxAssetsShareBasedPaymentAwardsCompensationDeduction_b55bf095-2984-42c8-835a-0a2c2b2019c3" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_mtrx_ValuationAllowanceOfDeferredTaxAssetsShareBasedPaymentAwardsCompensationRemainingBalance_cdd31132-ef0d-412f-ac95-ae601a50c749" xlink:href="mtrx-20220630.xsd#mtrx_ValuationAllowanceOfDeferredTaxAssetsShareBasedPaymentAwardsCompensationRemainingBalance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesDomain_c102ac2a-2497-431e-b92a-80a5ed61f31f" xlink:to="loc_mtrx_ValuationAllowanceOfDeferredTaxAssetsShareBasedPaymentAwardsCompensationRemainingBalance_cdd31132-ef0d-412f-ac95-ae601a50c749" xlink:type="arc" order="8"/>
  </link:definitionLink>
</link:linkbase>
