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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2025 Workiva-->
<!--r:17e40550-18f4-42cf-9459-0d7f4641ed39,g:90d5e4a1-6dca-44a9-8dd7-6c8833426e53-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:wcc="http://www.wesco.com/20250630" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2024-01-31" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.wesco.com/20250630">
  <xs:import namespace="http://fasb.org/srt/2025" schemaLocation="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd"/>
  <xs:import namespace="http://fasb.org/us-gaap/2025" schemaLocation="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/2024-01-31" schemaLocation="https://www.xbrl.org/dtr/type/2024-01-31/types.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/country/2025" schemaLocation="https://xbrl.sec.gov/country/2025/country-2025.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei/2025" schemaLocation="https://xbrl.sec.gov/dei/2025/dei-2025.xsd"/>
  <xs:annotation>
    <xs:appinfo>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="wcc-20250630_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="wcc-20250630_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="wcc-20250630_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="wcc-20250630_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="COVERPAGE" roleURI="http://www.wesco.com/role/COVERPAGE">
        <link:definition>0000001 - Document - COVER PAGE</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="CONSOLIDATEDBALANCESHEETS" roleURI="http://www.wesco.com/role/CONSOLIDATEDBALANCESHEETS">
        <link:definition>9952151 - Statement - CONSOLIDATED BALANCE SHEETS</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="CONSOLIDATEDBALANCESHEETSparentheticalitems" roleURI="http://www.wesco.com/role/CONSOLIDATEDBALANCESHEETSparentheticalitems">
        <link:definition>9952152 - Statement - CONSOLIDATED BALANCE SHEETS (parenthetical items)</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="CONSOLIDATEDSTATEMENTSOFINCOME" roleURI="http://www.wesco.com/role/CONSOLIDATEDSTATEMENTSOFINCOME">
        <link:definition>9952153 - Statement - CONSOLIDATED STATEMENTS OF INCOME</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="CONSOLIDATEDSTATEMENTSOFCASHFLOWS" roleURI="http://www.wesco.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS">
        <link:definition>9952154 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</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="CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYStatement" roleURI="http://www.wesco.com/role/CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYStatement">
        <link:definition>9952155 - Statement - CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY Statement</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="ORGANIZATION" roleURI="http://www.wesco.com/role/ORGANIZATION">
        <link:definition>9952156 - Disclosure - ORGANIZATION</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="ACCOUNTINGPOLICIES" roleURI="http://www.wesco.com/role/ACCOUNTINGPOLICIES">
        <link:definition>9952157 - Disclosure - ACCOUNTING POLICIES</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="REVENUENotes" roleURI="http://www.wesco.com/role/REVENUENotes">
        <link:definition>9952158 - Disclosure - REVENUE (Notes)</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="BusinessCombinationsAssetAcquisitionsandJointVentureFormation" roleURI="http://www.wesco.com/role/BusinessCombinationsAssetAcquisitionsandJointVentureFormation">
        <link:definition>9952159 - Disclosure - Business Combinations, Asset Acquisitions, and Joint Venture Formation</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="GOODWILLNotes" roleURI="http://www.wesco.com/role/GOODWILLNotes">
        <link:definition>9952160 - Disclosure - GOODWILL (Notes)</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="STOCKBASEDCOMPENSATIONNotes" roleURI="http://www.wesco.com/role/STOCKBASEDCOMPENSATIONNotes">
        <link:definition>9952161 - Disclosure - STOCK-BASED COMPENSATION (Notes)</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="EARNINGSPERSHARE" roleURI="http://www.wesco.com/role/EARNINGSPERSHARE">
        <link:definition>9952162 - Disclosure - EARNINGS PER SHARE</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="DEBTNotes" roleURI="http://www.wesco.com/role/DEBTNotes">
        <link:definition>9952163 - Disclosure - DEBT (Notes)</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="EMPLOYEEBENEFITPLANSNotes" roleURI="http://www.wesco.com/role/EMPLOYEEBENEFITPLANSNotes">
        <link:definition>9952164 - Disclosure - EMPLOYEE BENEFIT PLANS (Notes)</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="FAIRVALUENotes" roleURI="http://www.wesco.com/role/FAIRVALUENotes">
        <link:definition>9952165 - Disclosure - FAIR VALUE (Notes)</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="COMMITMENTSANDCONTINGENCIES" roleURI="http://www.wesco.com/role/COMMITMENTSANDCONTINGENCIES">
        <link:definition>9952166 - Disclosure - COMMITMENTS AND CONTINGENCIES</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="INCOMETAXES" roleURI="http://www.wesco.com/role/INCOMETAXES">
        <link:definition>9952167 - Disclosure - INCOME TAXES</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="SegmentReporting" roleURI="http://www.wesco.com/role/SegmentReporting">
        <link:definition>9952168 - Disclosure - Segment Reporting</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="SUBSEQUENTEVENTS" roleURI="http://www.wesco.com/role/SUBSEQUENTEVENTS">
        <link:definition>9952169 - Disclosure - SUBSEQUENT EVENTS</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="Equity" roleURI="http://www.wesco.com/role/Equity">
        <link:definition>9952170 - Disclosure - Equity</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="ACCOUNTINGPOLICIESPolicies" roleURI="http://www.wesco.com/role/ACCOUNTINGPOLICIESPolicies">
        <link:definition>9955511 - Disclosure - ACCOUNTING POLICIES (Policies)</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="RevenuefromContractwithCustomerPolicies" roleURI="http://www.wesco.com/role/RevenuefromContractwithCustomerPolicies">
        <link:definition>9955512 - Disclosure - Revenue from Contract with Customer (Policies)</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="REVENUETables" roleURI="http://www.wesco.com/role/REVENUETables">
        <link:definition>9955513 - Disclosure - REVENUE (Tables)</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="GOODWILLTables" roleURI="http://www.wesco.com/role/GOODWILLTables">
        <link:definition>9955514 - Disclosure - GOODWILL (Tables)</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="STOCKBASEDCOMPENSATIONTables" roleURI="http://www.wesco.com/role/STOCKBASEDCOMPENSATIONTables">
        <link:definition>9955515 - Disclosure - STOCK-BASED COMPENSATION (Tables)</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="EARNINGSPERSHARETables" roleURI="http://www.wesco.com/role/EARNINGSPERSHARETables">
        <link:definition>9955516 - Disclosure - EARNINGS PER SHARE (Tables)</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="DEBTTables" roleURI="http://www.wesco.com/role/DEBTTables">
        <link:definition>9955517 - Disclosure - DEBT (Tables)</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="FAIRVALUETables" roleURI="http://www.wesco.com/role/FAIRVALUETables">
        <link:definition>9955518 - Disclosure - FAIR VALUE (Tables)</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="SegmentReportingTables" roleURI="http://www.wesco.com/role/SegmentReportingTables">
        <link:definition>9955519 - Disclosure - Segment Reporting (Tables)</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="EquityTables" roleURI="http://www.wesco.com/role/EquityTables">
        <link:definition>9955520 - Disclosure - Equity (Tables)</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="ORGANIZATIONOrganizationDetails" roleURI="http://www.wesco.com/role/ORGANIZATIONOrganizationDetails">
        <link:definition>9955521 - Disclosure - ORGANIZATION Organization (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="ACCOUNTINGPOLICIESDetails" roleURI="http://www.wesco.com/role/ACCOUNTINGPOLICIESDetails">
        <link:definition>9955522 - Disclosure - ACCOUNTING POLICIES (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="REVENUEDetails" roleURI="http://www.wesco.com/role/REVENUEDetails">
        <link:definition>9955523 - Disclosure - REVENUE (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="REVENUEDeferredRevenueDetails" roleURI="http://www.wesco.com/role/REVENUEDeferredRevenueDetails">
        <link:definition>9955524 - Disclosure - REVENUE Deferred Revenue (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="REVENUEShippingandHandlingCostsDetails" roleURI="http://www.wesco.com/role/REVENUEShippingandHandlingCostsDetails">
        <link:definition>9955525 - Disclosure - REVENUE Shipping and Handling Costs (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="REVENUEVariableConsiderationDetails" roleURI="http://www.wesco.com/role/REVENUEVariableConsiderationDetails">
        <link:definition>9955526 - Disclosure - REVENUE Variable Consideration (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="REVENUERevenuePerformanceObligationDetails" roleURI="http://www.wesco.com/role/REVENUERevenuePerformanceObligationDetails">
        <link:definition>9955527 - Disclosure - REVENUE Revenue, Performance Obligation (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="BusinessCombinationsandAssetAcquisitionsDetails" roleURI="http://www.wesco.com/role/BusinessCombinationsandAssetAcquisitionsDetails">
        <link:definition>9955528 - Disclosure - Business Combinations and Asset Acquisitions (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="GOODWILLDetails" roleURI="http://www.wesco.com/role/GOODWILLDetails">
        <link:definition>9955529 - Disclosure - GOODWILL (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="STOCKBASEDCOMPENSATIONAWARDSDetails" roleURI="http://www.wesco.com/role/STOCKBASEDCOMPENSATIONAWARDSDetails">
        <link:definition>9955530 - Disclosure - STOCK-BASED COMPENSATION AWARDS (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="SCHEDULEOFSHAREBASEDCOMPENSATIONSTOCKOPTIONSANDSTOCKAPPRECIATIONRIGHTSAWARDACTIVITYDetails" roleURI="http://www.wesco.com/role/SCHEDULEOFSHAREBASEDCOMPENSATIONSTOCKOPTIONSANDSTOCKAPPRECIATIONRIGHTSAWARDACTIVITYDetails">
        <link:definition>9955531 - Disclosure - SCHEDULE OF SHARE-BASED COMPENSATION, STOCK OPTIONS AND STOCK APPRECIATION RIGHTS AWARD ACTIVITY (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="SCHEDULEOFSHAREBASEDPAYMENTAWARDVALUATIONASSUMPTIONSDetails" roleURI="http://www.wesco.com/role/SCHEDULEOFSHAREBASEDPAYMENTAWARDVALUATIONASSUMPTIONSDetails">
        <link:definition>9955532 - Disclosure - SCHEDULE OF SHARE-BASED PAYMENT AWARD, VALUATION ASSUMPTIONS (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="SUMMARYOFRESTRICTEDSTOCKUNITSDetails" roleURI="http://www.wesco.com/role/SUMMARYOFRESTRICTEDSTOCKUNITSDetails">
        <link:definition>9955533 - Disclosure - SUMMARY OF RESTRICTED STOCK UNITS (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="SUMMARYOFPERFORMANCEBASEDAWARDSDetails" roleURI="http://www.wesco.com/role/SUMMARYOFPERFORMANCEBASEDAWARDSDetails">
        <link:definition>9955534 - Disclosure - SUMMARY OF PERFORMANCE-BASED AWARDS (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="STOCKBASEDCOMPENSATIONDetails" roleURI="http://www.wesco.com/role/STOCKBASEDCOMPENSATIONDetails">
        <link:definition>9955535 - Disclosure - STOCK-BASED COMPENSATION (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="SummaryofNonQualifiedStockOptionsDetails" roleURI="http://www.wesco.com/role/SummaryofNonQualifiedStockOptionsDetails">
        <link:definition>9955536 - Disclosure - Summary of Non-Qualified Stock Options (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="SCHEDULEOFEARNINGSPERSHAREBASICANDDILUTEDDetails" roleURI="http://www.wesco.com/role/SCHEDULEOFEARNINGSPERSHAREBASICANDDILUTEDDetails">
        <link:definition>9955537 - Disclosure - SCHEDULE OF EARNINGS PER SHARE, BASIC AND DILUTED (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="EARNINGSPERSHAREDetails" roleURI="http://www.wesco.com/role/EARNINGSPERSHAREDetails">
        <link:definition>9955538 - 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="SCHEDULEOFDEBTDetails" roleURI="http://www.wesco.com/role/SCHEDULEOFDEBTDetails">
        <link:definition>9955539 - Disclosure - SCHEDULE OF DEBT (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="DEBTNarrativeDetails" roleURI="http://www.wesco.com/role/DEBTNarrativeDetails">
        <link:definition>9955540 - Disclosure - DEBT - Narrative (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="EMPLOYEEBENEFITPLANSNarrativeDetails" roleURI="http://www.wesco.com/role/EMPLOYEEBENEFITPLANSNarrativeDetails">
        <link:definition>9955541 - Disclosure - EMPLOYEE BENEFIT PLANS - Narrative (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="FAIRVALUEDetails" roleURI="http://www.wesco.com/role/FAIRVALUEDetails">
        <link:definition>9955542 - Disclosure - FAIR VALUE (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="INCOMETAXESDetails" roleURI="http://www.wesco.com/role/INCOMETAXESDetails">
        <link:definition>9955543 - Disclosure - INCOME TAXES (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="INCOMETAXESIncomeTaxRatesDetails" roleURI="http://www.wesco.com/role/INCOMETAXESIncomeTaxRatesDetails">
        <link:definition>9955544 - Disclosure - INCOME TAXES Income Tax Rates (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="SegmentReportingDetails" roleURI="http://www.wesco.com/role/SegmentReportingDetails">
        <link:definition>9955545 - Disclosure - Segment Reporting (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="SegmentReportingCapitalExpendituresDetails" roleURI="http://www.wesco.com/role/SegmentReportingCapitalExpendituresDetails">
        <link:definition>9955546 - Disclosure - Segment Reporting - Capital Expenditures (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="SegmentReportingADJEBITDAReconciliationsDetails" roleURI="http://www.wesco.com/role/SegmentReportingADJEBITDAReconciliationsDetails">
        <link:definition>9955547 - Disclosure - Segment Reporting - ADJ EBITDA Reconciliations (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="SUBSEQUENTEVENTSDetails" roleURI="http://www.wesco.com/role/SUBSEQUENTEVENTSDetails">
        <link:definition>9955548 - Disclosure - SUBSEQUENT EVENTS (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="EquityDetails" roleURI="http://www.wesco.com/role/EquityDetails">
        <link:definition>9955549 - Disclosure - Equity (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="EquityDetails_1" roleURI="http://www.wesco.com/role/EquityDetails_1">
        <link:definition>9955550 - Disclosure - Equity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xs:appinfo>
  </xs:annotation>
  <xs:element id="wcc_BusinessDivestitureTextBlock" abstract="false" name="BusinessDivestitureTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="wcc_EESMember" abstract="true" name="EESMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wcc_CSSMember" abstract="true" name="CSSMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wcc_UBSMember" abstract="true" name="UBSMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wcc_RevenueVariableConsiderationConstraintIncreaseDecrease" abstract="false" name="RevenueVariableConsiderationConstraintIncreaseDecrease" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wcc_IndustrialSoftwareSolutionsMember" abstract="true" name="IndustrialSoftwareSolutionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wcc_AscentMember" abstract="true" name="AscentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wcc_IndependentElectricSupplyMember" abstract="true" name="IndependentElectricSupplyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wcc_EntroCIMMember" abstract="true" name="EntroCIMMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wcc_BusinessCombinationRecognizedAssetAcquiredDistributionAgreementIntangibleAsset" abstract="false" name="BusinessCombinationRecognizedAssetAcquiredDistributionAgreementIntangibleAsset" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wcc_BusinessCombinationRecognizedAssetAcquiredCustomerRelationshipIntangibleAsset" abstract="false" name="BusinessCombinationRecognizedAssetAcquiredCustomerRelationshipIntangibleAsset" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wcc_BusinessCombinationRecognizedAssetAcquiredOtherCurrentAndNoncurrentAssets" abstract="false" name="BusinessCombinationRecognizedAssetAcquiredOtherCurrentAndNoncurrentAssets" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wcc_BusinessCombinationRecognizedLiabilityAssumedAccruedPayrollAndBenefitCosts" abstract="false" name="BusinessCombinationRecognizedLiabilityAssumedAccruedPayrollAndBenefitCosts" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wcc_BusinessCombinationRecognizedLiabilityAssumedOtherCurrentAndNoncurrentLiabilities" abstract="false" name="BusinessCombinationRecognizedLiabilityAssumedOtherCurrentAndNoncurrentLiabilities" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wcc_PaymentToAcquireBusinessFairValueOfCashConsideration" abstract="false" name="PaymentToAcquireBusinessFairValueOfCashConsideration" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wcc_BasePurchasePriceForDivestitureOfBusiness." abstract="false" name="BasePurchasePriceForDivestitureOfBusiness." nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wcc_FiniteLivedIntangibleAssetExpectedAmortizationTotal" abstract="false" name="FiniteLivedIntangibleAssetExpectedAmortizationTotal" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wcc_A2020PerformanceSharesMember" abstract="true" name="A2020PerformanceSharesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wcc_AccountsReceivableSecuritizationFacilityMember" abstract="true" name="AccountsReceivableSecuritizationFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wcc_A600SeniorNotesDue2025Member" abstract="true" name="A600SeniorNotesDue2025Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wcc_A7250SeniorNotesDue2028Member" abstract="true" name="A7250SeniorNotesDue2028Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wcc_A6.375SeniorNotesDue2029Member" abstract="true" name="A6.375SeniorNotesDue2029Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wcc_A6.625SeniorNotesDue2032Member" abstract="true" name="A6.625SeniorNotesDue2032Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wcc_A6.375SeniorNotesDue2033Member" abstract="true" name="A6.375SeniorNotesDue2033Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wcc_LineOfCreditFacilityOpportunityToIncreaseBorrowingCapacity" abstract="false" name="LineOfCreditFacilityOpportunityToIncreaseBorrowingCapacity" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wcc_DiscountPercentageOfParValue" abstract="false" name="DiscountPercentageOfParValue" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="wcc_PercentageOfPrincipalAmountOfSeniorNotesAcceleratedUnderDefault" abstract="false" name="PercentageOfPrincipalAmountOfSeniorNotesAcceleratedUnderDefault" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="wcc_WESCODeferredCompensationPlanMemberMember" abstract="true" name="WESCODeferredCompensationPlanMemberMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <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_SellingGeneralAndAdministrativePayrollExpenses" abstract="false" name="SellingGeneralAndAdministrativePayrollExpenses" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" 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:element id="wcc_RedemptionPricePerShareIncludingAccruedDividends" abstract="false" name="RedemptionPricePerShareIncludingAccruedDividends" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="wcc_O2025Q1DividendsMember" abstract="true" name="O2025Q1DividendsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wcc_O2024Q1DividendsMember" abstract="true" name="O2024Q1DividendsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wcc_O2025Q2DividendsMember" abstract="true" name="O2025Q2DividendsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="wcc_O2024Q2DividendsMember" abstract="true" name="O2024Q2DividendsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
