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        <link:definition>9955526 - Disclosure - BUSINESS SEGMENTS (Tables)</link:definition>
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        <link:definition>9955527 - Disclosure - Schedule II - Valuation and Qualifying Accounts (Tables)</link:definition>
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      <link:roleType id="GOODWILLANDINTANGIBLEASSETSTEXTUALSDetails" roleURI="http://www.wesco.com/role/GOODWILLANDINTANGIBLEASSETSTEXTUALSDetails">
        <link:definition>9955533 - Disclosure - GOODWILL AND INTANGIBLE ASSETS - TEXTUALS (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType id="GOODWILLANDINTANGIBLEASSETSSCHEDULEOFGOODWILLDetails" roleURI="http://www.wesco.com/role/GOODWILLANDINTANGIBLEASSETSSCHEDULEOFGOODWILLDetails">
        <link:definition>9955534 - Disclosure - GOODWILL AND INTANGIBLE ASSETS - SCHEDULE OF GOODWILL (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType id="GOODWILLANDINTANGIBLEASSETSSCHEDULEOFINTANGIBLEASSETSBYMAJORCLASSDetails" roleURI="http://www.wesco.com/role/GOODWILLANDINTANGIBLEASSETSSCHEDULEOFINTANGIBLEASSETSBYMAJORCLASSDetails">
        <link:definition>9955535 - Disclosure - GOODWILL AND INTANGIBLE ASSETS - SCHEDULE OF INTANGIBLE ASSETS BY MAJOR CLASS (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType id="GOODWILLANDINTANGIBLEASSETSSCHEDULEOFEXPECTEDAMORTIZATIONEXPENSEDetails" roleURI="http://www.wesco.com/role/GOODWILLANDINTANGIBLEASSETSSCHEDULEOFEXPECTEDAMORTIZATIONEXPENSEDetails">
        <link:definition>9955536 - Disclosure - GOODWILL AND INTANGIBLE ASSETS - SCHEDULE OF EXPECTED AMORTIZATION EXPENSE (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType id="ACQUISITIONSDetails" roleURI="http://www.wesco.com/role/ACQUISITIONSDetails">
        <link:definition>9955537 - Disclosure - ACQUISITIONS (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SCHEDULEOFCONSIDERATIONTRANSFERREDDetails" roleURI="http://www.wesco.com/role/SCHEDULEOFCONSIDERATIONTRANSFERREDDetails">
        <link:definition>9955538 - Disclosure - SCHEDULE OF CONSIDERATION TRANSFERRED (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType id="SCHEDULEOFASSUMEDASSETSANDLIABILITIESDetails" roleURI="http://www.wesco.com/role/SCHEDULEOFASSUMEDASSETSANDLIABILITIESDetails">
        <link:definition>9955539 - Disclosure - SCHEDULE OF ASSUMED ASSETS AND LIABILITIES (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType id="ASSETANDLIABILITIESHELDFORSALEDetails" roleURI="http://www.wesco.com/role/ASSETANDLIABILITIESHELDFORSALEDetails">
        <link:definition>9955540 - Disclosure - ASSET AND LIABILITIES HELD FOR SALE (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PROPERTYBUILDINGSANDEQUIPMENTSCHEDULEOFPROPERTYBUILDINGSANDEQUIPMENTDetails" roleURI="http://www.wesco.com/role/PROPERTYBUILDINGSANDEQUIPMENTSCHEDULEOFPROPERTYBUILDINGSANDEQUIPMENTDetails">
        <link:definition>9955541 - Disclosure - PROPERTY, BUILDINGS AND EQUIPMENT - SCHEDULE OF PROPERTY, BUILDINGS AND EQUIPMENT (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PROPERTYBUILDINGSANDEQUIPMENTPROPERTYBUILDINGSANDEQUIPMENTDetails" roleURI="http://www.wesco.com/role/PROPERTYBUILDINGSANDEQUIPMENTPROPERTYBUILDINGSANDEQUIPMENTDetails">
        <link:definition>9955542 - Disclosure - PROPERTY, BUILDINGS AND EQUIPMENT - PROPERTY, BUILDINGS AND EQUIPMENT (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEASESDetails" roleURI="http://www.wesco.com/role/LEASESDetails">
        <link:definition>9955543 - Disclosure - LEASES (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEASESSupplementalbalancesheetinformationDetails" roleURI="http://www.wesco.com/role/LEASESSupplementalbalancesheetinformationDetails">
        <link:definition>9955544 - Disclosure - LEASES Supplemental balance sheet information (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEASESLeaseCostDetails" roleURI="http://www.wesco.com/role/LEASESLeaseCostDetails">
        <link:definition>9955545 - Disclosure - LEASES Lease, Cost (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEASESSupplementalCashFlowInformationDetails" roleURI="http://www.wesco.com/role/LEASESSupplementalCashFlowInformationDetails">
        <link:definition>9955546 - Disclosure - LEASES Supplemental Cash Flow Information (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEASESLesseeOperatingLeaseLiabilityMaturityDetails" roleURI="http://www.wesco.com/role/LEASESLesseeOperatingLeaseLiabilityMaturityDetails">
        <link:definition>9955547 - Disclosure - LEASES Lessee, Operating Lease, Liability, Maturity (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DEBTSCHEDULEOFDEBTDetails" roleURI="http://www.wesco.com/role/DEBTSCHEDULEOFDEBTDetails">
        <link:definition>9955548 - Disclosure - DEBT - SCHEDULE OF DEBT (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DEBTDetails" roleURI="http://www.wesco.com/role/DEBTDetails">
        <link:definition>9955549 - Disclosure - DEBT (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DEBTSCHEDULEOFMATURITIESOFLONGTERMDEBTDetails" roleURI="http://www.wesco.com/role/DEBTSCHEDULEOFMATURITIESOFLONGTERMDEBTDetails">
        <link:definition>9955550 - Disclosure - DEBT - SCHEDULE OF MATURITIES OF LONG-TERM DEBT (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKHOLDERSEQUITYDetails" roleURI="http://www.wesco.com/role/STOCKHOLDERSEQUITYDetails">
        <link:definition>9955551 - Disclosure - STOCKHOLDERS' EQUITY (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INCOMETAXESADDITIONALINFORMATIONDetail" roleURI="http://www.wesco.com/role/INCOMETAXESADDITIONALINFORMATIONDetail">
        <link:definition>9955552 - Disclosure - INCOME TAXES - ADDITIONAL INFORMATION (Detail)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INCOMETAXESSCHEDULEOFINCOMEBEFOREINCOMETAXDOMESTICANDFOREIGNDetails" roleURI="http://www.wesco.com/role/INCOMETAXESSCHEDULEOFINCOMEBEFOREINCOMETAXDOMESTICANDFOREIGNDetails">
        <link:definition>9955553 - Disclosure - INCOME TAXES - SCHEDULE OF INCOME BEFORE INCOME TAX, DOMESTIC AND FOREIGN (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INCOMETAXESSCHEDULEOFCOMPONENTSOFINCOMETAXEXPENSEDetails" roleURI="http://www.wesco.com/role/INCOMETAXESSCHEDULEOFCOMPONENTSOFINCOMETAXEXPENSEDetails">
        <link:definition>9955554 - Disclosure - INCOME TAXES - SCHEDULE OF COMPONENTS OF INCOME TAX EXPENSE (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INCOMETAXESSCHEDULEOFEFFECTIVEINCOMETAXRATERECONCILIATIONDetails" roleURI="http://www.wesco.com/role/INCOMETAXESSCHEDULEOFEFFECTIVEINCOMETAXRATERECONCILIATIONDetails">
        <link:definition>9955555 - Disclosure - INCOME TAXES - SCHEDULE OF EFFECTIVE INCOME TAX RATE RECONCILIATION (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INCOMETAXESSCHEDULEOFDEFERREDTAXASSETSANDLIABILITIESDetails" roleURI="http://www.wesco.com/role/INCOMETAXESSCHEDULEOFDEFERREDTAXASSETSANDLIABILITIESDetails">
        <link:definition>9955556 - Disclosure - INCOME TAXES - SCHEDULE OF DEFERRED TAX ASSETS AND LIABILITIES (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INCOMETAXESSCHEDULEOFINCOMETAXCONTINGENCIESDetails" roleURI="http://www.wesco.com/role/INCOMETAXESSCHEDULEOFINCOMETAXCONTINGENCIESDetails">
        <link:definition>9955557 - Disclosure - INCOME TAXES - SCHEDULE OF INCOME TAX CONTINGENCIES (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INCOMETAXESPAIDDetails" roleURI="http://www.wesco.com/role/INCOMETAXESPAIDDetails">
        <link:definition>9955558 - Disclosure - INCOME TAXES PAID (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EARNINGSPERSHARESCHEDULEOFEARNINGSPERSHAREBASICANDDILUTEDDetails" roleURI="http://www.wesco.com/role/EARNINGSPERSHARESCHEDULEOFEARNINGSPERSHAREBASICANDDILUTEDDetails">
        <link:definition>9955559 - Disclosure - EARNINGS PER SHARE - SCHEDULE OF EARNINGS PER SHARE, BASIC AND DILUTED (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EARNINGSPERSHAREDetails" roleURI="http://www.wesco.com/role/EARNINGSPERSHAREDetails">
        <link:definition>9955560 - Disclosure - EARNINGS PER SHARE (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EMPLOYEEBENEFITPLANSTEXTUALSDetails" roleURI="http://www.wesco.com/role/EMPLOYEEBENEFITPLANSTEXTUALSDetails">
        <link:definition>9955561 - Disclosure - EMPLOYEE BENEFIT PLANS TEXTUALS (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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      </link:roleType>
      <link:roleType id="EMPLOYEEBENEFITPLANSBenefitObligationsPlanAssetsandFundedStatusDetails" roleURI="http://www.wesco.com/role/EMPLOYEEBENEFITPLANSBenefitObligationsPlanAssetsandFundedStatusDetails">
        <link:definition>9955562 - Disclosure - EMPLOYEE BENEFIT PLANS Benefit Obligations, Plan Assets, and Funded Status (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EMPLOYEEBENEFITPLANSPensionCostsDetails" roleURI="http://www.wesco.com/role/EMPLOYEEBENEFITPLANSPensionCostsDetails">
        <link:definition>9955563 - Disclosure - EMPLOYEE BENEFIT PLANS Pension Costs (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EMPLOYEEBENEFITPLANSAssumptionsDetails" roleURI="http://www.wesco.com/role/EMPLOYEEBENEFITPLANSAssumptionsDetails">
        <link:definition>9955564 - Disclosure - EMPLOYEE BENEFIT PLANS Assumptions (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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      </link:roleType>
      <link:roleType id="EMPLOYEEBENEFITPLANSAOCIDetails" roleURI="http://www.wesco.com/role/EMPLOYEEBENEFITPLANSAOCIDetails">
        <link:definition>9955565 - Disclosure - EMPLOYEE BENEFIT PLANS - AOCI (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EMPLOYEEBENEFITPLANSBenefitpaymentsDetails" roleURI="http://www.wesco.com/role/EMPLOYEEBENEFITPLANSBenefitpaymentsDetails">
        <link:definition>9955566 - Disclosure - EMPLOYEE BENEFIT PLANS Benefit payments (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EMPLOYEEBENEFITPLANSAssetallocationsDetails" roleURI="http://www.wesco.com/role/EMPLOYEEBENEFITPLANSAssetallocationsDetails">
        <link:definition>9955567 - Disclosure - EMPLOYEE BENEFIT PLANS Asset allocations (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType id="EMPLOYEEBENEFITPLANSFairvalueplanassetsDetails" roleURI="http://www.wesco.com/role/EMPLOYEEBENEFITPLANSFairvalueplanassetsDetails">
        <link:definition>9955568 - Disclosure - EMPLOYEE BENEFIT PLANS Fair value plan assets (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EMPLOYEEBENEFITPLANSOtherBenefitsDetails" roleURI="http://www.wesco.com/role/EMPLOYEEBENEFITPLANSOtherBenefitsDetails">
        <link:definition>9955569 - Disclosure - EMPLOYEE BENEFIT PLANS - Other Benefits (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKBASEDCOMPENSATIONDetails" roleURI="http://www.wesco.com/role/STOCKBASEDCOMPENSATIONDetails">
        <link:definition>9955570 - Disclosure - STOCK-BASED COMPENSATION (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKBASEDCOMPENSATIONSCHEDULEOFSHAREBASEDCOMPENSATIONSTOCKOPTIONSANDSTOCKAPPRECIATIONRIGHTSAWARDACTIVITYDetails" roleURI="http://www.wesco.com/role/STOCKBASEDCOMPENSATIONSCHEDULEOFSHAREBASEDCOMPENSATIONSTOCKOPTIONSANDSTOCKAPPRECIATIONRIGHTSAWARDACTIVITYDetails">
        <link:definition>9955571 - Disclosure - STOCK-BASED COMPENSATION - SCHEDULE OF SHARE-BASED COMPENSATION, STOCK OPTIONS AND STOCK APPRECIATION RIGHTS AWARD ACTIVITY (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKBASEDCOMPENSATIONSUMMARYOFRESTRICTEDSTOCKUNITSANDPERFORMANCEBASEDAWARDSDetails" roleURI="http://www.wesco.com/role/STOCKBASEDCOMPENSATIONSUMMARYOFRESTRICTEDSTOCKUNITSANDPERFORMANCEBASEDAWARDSDetails">
        <link:definition>9955572 - Disclosure - STOCK-BASED COMPENSATION - SUMMARY OF RESTRICTED STOCK UNITS AND PERFORMANCE-BASED AWARDS (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKBASEDCOMPENSATIONSCHEDULEOFSHAREBASEDPAYMENTAWARDSVALUATIONASSUMPTIONSDetails" roleURI="http://www.wesco.com/role/STOCKBASEDCOMPENSATIONSCHEDULEOFSHAREBASEDPAYMENTAWARDSVALUATIONASSUMPTIONSDetails">
        <link:definition>9955573 - Disclosure - STOCK-BASED COMPENSATION - SCHEDULE OF SHARE-BASED PAYMENT AWARDS, VALUATION ASSUMPTIONS (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKBASEDCOMPENSATIONSCHEDULEOFSHAREBASEDPAYMENTAWARDPERFORMANCEBASEDAWARDSVALUATIONASSUMPTIONSDetails" roleURI="http://www.wesco.com/role/STOCKBASEDCOMPENSATIONSCHEDULEOFSHAREBASEDPAYMENTAWARDPERFORMANCEBASEDAWARDSVALUATIONASSUMPTIONSDetails">
        <link:definition>9955574 - Disclosure - STOCK-BASED COMPENSATION - SCHEDULE OF SHARE-BASED PAYMENT AWARD, PERFORMANCE-BASED AWARDS, VALUATION ASSUMPTIONS (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="COMMITMENTSANDCONTINGENCIESDetails" roleURI="http://www.wesco.com/role/COMMITMENTSANDCONTINGENCIESDetails">
        <link:definition>9955575 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BUSINESSSEGMENTSScheduleofSegmentReportingInformationbySegmentDetails" roleURI="http://www.wesco.com/role/BUSINESSSEGMENTSScheduleofSegmentReportingInformationbySegmentDetails">
        <link:definition>9955576 - Disclosure - BUSINESS SEGMENTS - Schedule of Segment Reporting Information, by Segment (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BUSINESSSEGMENTSDetails" roleURI="http://www.wesco.com/role/BUSINESSSEGMENTSDetails">
        <link:definition>9955577 - Disclosure - BUSINESS SEGMENTS (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
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      <link:roleType id="SEGMENTSANDRELATEDINFORMATIONSCHEDULEOFREVENUEFROMEXTERNALCUSTOMERSANDLONGLIVEDASSETSBYGEOGRAPHICALAREASDetails" roleURI="http://www.wesco.com/role/SEGMENTSANDRELATEDINFORMATIONSCHEDULEOFREVENUEFROMEXTERNALCUSTOMERSANDLONGLIVEDASSETSBYGEOGRAPHICALAREASDetails">
        <link:definition>9955578 - Disclosure - SEGMENTS AND RELATED INFORMATION - SCHEDULE OF REVENUE FROM EXTERNAL CUSTOMERS AND LONG LIVED ASSETS, BY GEOGRAPHICAL AREAS (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SUBSEQUENTEVENTSDetails" roleURI="http://www.wesco.com/role/SUBSEQUENTEVENTSDetails">
        <link:definition>9955579 - Disclosure - SUBSEQUENT EVENTS (Details)</link:definition>
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        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType id="ScheduleIIValuationandQualifyingAccountsDetails" roleURI="http://www.wesco.com/role/ScheduleIIValuationandQualifyingAccountsDetails">
        <link:definition>9955580 - Disclosure - Schedule II - Valuation and Qualifying Accounts (Details)</link:definition>
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  <xs:element id="wcc_ScheduleOfEmployeeBenefitPlansTable" abstract="true" name="ScheduleOfEmployeeBenefitPlansTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="wcc_WESCODeferredCompensationPlanMember" abstract="true" name="WESCODeferredCompensationPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wcc_WESCODefinedContributionMember" abstract="true" name="WESCODefinedContributionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wcc_WESCODistributionCanadaDefinedContributionPlanMember" abstract="true" name="WESCODistributionCanadaDefinedContributionPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wcc_AnixterEmployeeSavingsPlanMember" abstract="true" name="AnixterEmployeeSavingsPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wcc_AnixterDeferredCompensationPlanMember" abstract="true" name="AnixterDeferredCompensationPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wcc_DefinedContributionPensionPlanForEmployeesOfAnixterCanadaIncMember" abstract="true" name="DefinedContributionPensionPlanForEmployeesOfAnixterCanadaIncMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wcc_CanadianDefinedContributionPlanMergerMember" abstract="true" name="CanadianDefinedContributionPlanMergerMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wcc_USDefinedContributionPlanMergerMember" abstract="true" name="USDefinedContributionPlanMergerMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wcc_U.S.DefinedContributionPlanMember" abstract="true" name="U.S.DefinedContributionPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wcc_CanadianDefinedContributionPlanMember" abstract="true" name="CanadianDefinedContributionPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wcc_ScheduleOfEmployeeBenefitPlansLineItems" abstract="true" name="ScheduleOfEmployeeBenefitPlansLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="wcc_DefinedContributionDiscretionaryContributionPercentage" abstract="false" name="DefinedContributionDiscretionaryContributionPercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="wcc_DefinedBenefitPlanNumberOfPlansWithProjectedBenefitObligationsInExcessOfFairValueOfPlanAssets" abstract="false" name="DefinedBenefitPlanNumberOfPlansWithProjectedBenefitObligationsInExcessOfFairValueOfPlanAssets" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="wcc_DefinedBenefitPlanNumberOfPlansWithAccumulatedBenefitObligationsInExcessOfFairValueOfPlanAssets" abstract="false" name="DefinedBenefitPlanNumberOfPlansWithAccumulatedBenefitObligationsInExcessOfFairValueOfPlanAssets" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="wcc_DefinedBenefitPlanAssetsActualGainLoss" abstract="false" name="DefinedBenefitPlanAssetsActualGainLoss" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="wcc_DefinedContributionPlanEmployerMatchingContributionGreaterThan20YearsOfServicePercentOfEmployeesGrossPay" abstract="false" name="DefinedContributionPlanEmployerMatchingContributionGreaterThan20YearsOfServicePercentOfEmployeesGrossPay" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="wcc_DefinedBenefitPlanBenefitsPaidFromCompanyAssets" abstract="false" name="DefinedBenefitPlanBenefitsPaidFromCompanyAssets" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wcc_OtherComprehensiveIncomeLossDefinedBenefitPlanSettlementGainLossBeforeTax" abstract="false" name="OtherComprehensiveIncomeLossDefinedBenefitPlanSettlementGainLossBeforeTax" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wcc_OtherComprehensiveIncomeLossDefinedBenefitPlanForeignCurrencyTranslationGainLoss" abstract="false" name="OtherComprehensiveIncomeLossDefinedBenefitPlanForeignCurrencyTranslationGainLoss" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wcc_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPlanTax" abstract="false" name="AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPlanTax" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wcc_OtherComprehensiveIncomeLossDefinedBenefitPlanCurtailmentGainLossBeforeTax" abstract="false" name="OtherComprehensiveIncomeLossDefinedBenefitPlanCurtailmentGainLossBeforeTax" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wcc_InsuranceProductMember" abstract="true" name="InsuranceProductMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wcc_A2024PerformanceSharesMember" abstract="true" name="A2024PerformanceSharesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wcc_A2021PerformanceSharesMember" abstract="true" name="A2021PerformanceSharesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wcc_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsAndStockAppreciationRightsOutstandingRollForward" abstract="true" name="ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsAndStockAppreciationRightsOutstandingRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="wcc_SellingGeneralAndAdministrativePayrollExpenses" abstract="false" name="SellingGeneralAndAdministrativePayrollExpenses" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wcc_AdjustedEBITDA" abstract="false" name="AdjustedEBITDA" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wcc_AdjustedEBITDAMarginPercentage" abstract="false" name="AdjustedEBITDAMarginPercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
</xs:schema>
