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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019ecf33-f2dd-756e-8f52-70804bf5f951,g:b287ea41-b3f0-44ce-a173-2cb97160f1c5-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:cstm="http://www.constellium.com/20260630" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2024-01-31" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.constellium.com/20260630">
  <xs:import namespace="http://fasb.org/srt/2026" schemaLocation="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd"/>
  <xs:import namespace="http://fasb.org/us-gaap/2026" schemaLocation="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.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.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei/2026" schemaLocation="https://xbrl.sec.gov/dei/2026/dei-2026.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/ecd/2026" schemaLocation="https://xbrl.sec.gov/ecd/2026/ecd-2026.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="cstm-20260630_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="cstm-20260630_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="cstm-20260630_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="cstm-20260630_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="COVER" roleURI="http://www.constellium.com/role/COVER">
        <link:definition>0000001 - Document - COVER</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="CONSOLIDATEDINCOMESTATEMENTSunaudited" roleURI="http://www.constellium.com/role/CONSOLIDATEDINCOMESTATEMENTSunaudited">
        <link:definition>9952151 - Statement - CONSOLIDATED INCOME STATEMENTS (unaudited)</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="CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMEunaudited" roleURI="http://www.constellium.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMEunaudited">
        <link:definition>9952152 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited)</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="CONSOLIDATEDBALANCESHEETSunaudited" roleURI="http://www.constellium.com/role/CONSOLIDATEDBALANCESHEETSunaudited">
        <link:definition>9952153 - Statement - CONSOLIDATED BALANCE SHEETS (unaudited)</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="CONSOLIDATEDBALANCESHEETSunauditedParenthetical" roleURI="http://www.constellium.com/role/CONSOLIDATEDBALANCESHEETSunauditedParenthetical">
        <link:definition>9952154 - Statement - CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical)</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="CONSOLIDATEDSTATEMENTSOFCHANGESINEQUITYunaudited" roleURI="http://www.constellium.com/role/CONSOLIDATEDSTATEMENTSOFCHANGESINEQUITYunaudited">
        <link:definition>9952155 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (unaudited)</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="CONSOLIDATEDSTATEMENTSOFCASHFLOWSunaudited" roleURI="http://www.constellium.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWSunaudited">
        <link:definition>9952156 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited)</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="BUSINESSANDSUMMARYOFACCOUNTINGPOLICIES" roleURI="http://www.constellium.com/role/BUSINESSANDSUMMARYOFACCOUNTINGPOLICIES">
        <link:definition>9952157 - Disclosure - BUSINESS AND SUMMARY OF 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="REVENUE" roleURI="http://www.constellium.com/role/REVENUE">
        <link:definition>9952158 - Disclosure - REVENUE</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="SEGMENTINFORMATION" roleURI="http://www.constellium.com/role/SEGMENTINFORMATION">
        <link:definition>9952159 - Disclosure - SEGMENT INFORMATION</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="OTHERGAINSANDLOSSESNET" roleURI="http://www.constellium.com/role/OTHERGAINSANDLOSSESNET">
        <link:definition>9952160 - Disclosure - OTHER GAINS AND LOSSES - NET</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="FINANCECOSTSNET" roleURI="http://www.constellium.com/role/FINANCECOSTSNET">
        <link:definition>9952161 - Disclosure - FINANCE COSTS - NET</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="INCOMETAX" roleURI="http://www.constellium.com/role/INCOMETAX">
        <link:definition>9952162 - Disclosure - INCOME TAX</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.constellium.com/role/EARNINGSPERSHARE">
        <link:definition>9952163 - 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="TRADERECEIVABLESANDOTHER" roleURI="http://www.constellium.com/role/TRADERECEIVABLESANDOTHER">
        <link:definition>9952164 - Disclosure - TRADE RECEIVABLES AND OTHER</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="INVENTORIES" roleURI="http://www.constellium.com/role/INVENTORIES">
        <link:definition>9952165 - Disclosure - INVENTORIES</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="TRADEPAYABLESANDOTHER" roleURI="http://www.constellium.com/role/TRADEPAYABLESANDOTHER">
        <link:definition>9952166 - Disclosure - TRADE PAYABLES AND OTHER</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="DEBT" roleURI="http://www.constellium.com/role/DEBT">
        <link:definition>9952167 - Disclosure - DEBT</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="FINANCIALINSTRUMENTS" roleURI="http://www.constellium.com/role/FINANCIALINSTRUMENTS">
        <link:definition>9952168 - Disclosure - FINANCIAL INSTRUMENTS</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="PENSIONANDOTHERPOSTEMPLOYMENTBENEFITOBLIGATIONS" roleURI="http://www.constellium.com/role/PENSIONANDOTHERPOSTEMPLOYMENTBENEFITOBLIGATIONS">
        <link:definition>9952169 - Disclosure - PENSION AND OTHER POST-EMPLOYMENT BENEFIT OBLIGATIONS</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="PROVISIONS" roleURI="http://www.constellium.com/role/PROVISIONS">
        <link:definition>9952170 - Disclosure - PROVISIONS</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="ACCUMULATEDOTHERCOMPREHENSIVEINCOME" roleURI="http://www.constellium.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOME">
        <link:definition>9952171 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE 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="SHAREBASEDCOMPENSATION" roleURI="http://www.constellium.com/role/SHAREBASEDCOMPENSATION">
        <link:definition>9952172 - Disclosure - SHARE-BASED COMPENSATION</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="ACQUISITIONANDDISPOSALOFSUBSIDIARIES" roleURI="http://www.constellium.com/role/ACQUISITIONANDDISPOSALOFSUBSIDIARIES">
        <link:definition>9952173 - Disclosure - ACQUISITION AND DISPOSAL OF SUBSIDIARIES</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.constellium.com/role/SUBSEQUENTEVENTS">
        <link:definition>9952174 - 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="BUSINESSANDSUMMARYOFACCOUNTINGPOLICIESPolicies" roleURI="http://www.constellium.com/role/BUSINESSANDSUMMARYOFACCOUNTINGPOLICIESPolicies">
        <link:definition>9955511 - Disclosure - BUSINESS AND SUMMARY OF 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="REVENUETables" roleURI="http://www.constellium.com/role/REVENUETables">
        <link:definition>9955512 - 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="SEGMENTINFORMATIONTables" roleURI="http://www.constellium.com/role/SEGMENTINFORMATIONTables">
        <link:definition>9955513 - Disclosure - SEGMENT INFORMATION (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="OTHERGAINSANDLOSSESNETTables" roleURI="http://www.constellium.com/role/OTHERGAINSANDLOSSESNETTables">
        <link:definition>9955514 - Disclosure - OTHER GAINS AND LOSSES - NET (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="FINANCECOSTSNETTables" roleURI="http://www.constellium.com/role/FINANCECOSTSNETTables">
        <link:definition>9955515 - Disclosure - FINANCE COSTS - NET (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.constellium.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="TRADERECEIVABLESANDOTHERTables" roleURI="http://www.constellium.com/role/TRADERECEIVABLESANDOTHERTables">
        <link:definition>9955517 - Disclosure - TRADE RECEIVABLES AND OTHER (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="INVENTORIESTables" roleURI="http://www.constellium.com/role/INVENTORIESTables">
        <link:definition>9955518 - Disclosure - INVENTORIES (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="TRADEPAYABLESANDOTHERTables" roleURI="http://www.constellium.com/role/TRADEPAYABLESANDOTHERTables">
        <link:definition>9955519 - Disclosure - TRADE PAYABLES AND OTHER (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.constellium.com/role/DEBTTables">
        <link:definition>9955520 - 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="FINANCIALINSTRUMENTSTables" roleURI="http://www.constellium.com/role/FINANCIALINSTRUMENTSTables">
        <link:definition>9955521 - Disclosure - FINANCIAL INSTRUMENTS (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="PENSIONANDOTHERPOSTEMPLOYMENTBENEFITOBLIGATIONSTables" roleURI="http://www.constellium.com/role/PENSIONANDOTHERPOSTEMPLOYMENTBENEFITOBLIGATIONSTables">
        <link:definition>9955522 - Disclosure - PENSION AND OTHER POST-EMPLOYMENT BENEFIT OBLIGATIONS (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="PROVISIONSTables" roleURI="http://www.constellium.com/role/PROVISIONSTables">
        <link:definition>9955523 - Disclosure - PROVISIONS (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="ACCUMULATEDOTHERCOMPREHENSIVEINCOMETables" roleURI="http://www.constellium.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMETables">
        <link:definition>9955524 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (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="SHAREBASEDCOMPENSATIONTables" roleURI="http://www.constellium.com/role/SHAREBASEDCOMPENSATIONTables">
        <link:definition>9955525 - Disclosure - SHARE-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="BUSINESSANDSUMMARYOFACCOUNTINGPOLICIESDetails" roleURI="http://www.constellium.com/role/BUSINESSANDSUMMARYOFACCOUNTINGPOLICIESDetails">
        <link:definition>9955526 - Disclosure - BUSINESS AND SUMMARY OF 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="REVENUEDisclosureofrevenuedisaggregatedbyproductDetails" roleURI="http://www.constellium.com/role/REVENUEDisclosureofrevenuedisaggregatedbyproductDetails">
        <link:definition>9955527 - Disclosure - REVENUE - Disclosure of revenue disaggregated by product (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="SEGMENTINFORMATIONNarrativeDetails" roleURI="http://www.constellium.com/role/SEGMENTINFORMATIONNarrativeDetails">
        <link:definition>9955528 - Disclosure - SEGMENT INFORMATION - 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="SEGMENTINFORMATIONSegmentRevenueSegmentCostandAdjustedEBITDADetails" roleURI="http://www.constellium.com/role/SEGMENTINFORMATIONSegmentRevenueSegmentCostandAdjustedEBITDADetails">
        <link:definition>9955529 - Disclosure - SEGMENT INFORMATION - Segment Revenue Segment Cost and Adjusted EBITDA (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="SEGMENTINFORMATIONScheduleofSegmentAdjustedEBITDAandreconciliationofAdjustedEBITDAtoNetIncomeDetails" roleURI="http://www.constellium.com/role/SEGMENTINFORMATIONScheduleofSegmentAdjustedEBITDAandreconciliationofAdjustedEBITDAtoNetIncomeDetails">
        <link:definition>9955530 - Disclosure - SEGMENT INFORMATION - Schedule of Segment Adjusted EBITDA and reconciliation of Adjusted EBITDA to Net Income (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="SEGMENTINFORMATIONScheduleofSegmentCapitalExpendituresDetails" roleURI="http://www.constellium.com/role/SEGMENTINFORMATIONScheduleofSegmentCapitalExpendituresDetails">
        <link:definition>9955531 - Disclosure - SEGMENT INFORMATION - Schedule of Segment 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="SEGMENTINFORMATIONScheduleofSegmentdepreciationamortizationandimpairmentexpenseDetails" roleURI="http://www.constellium.com/role/SEGMENTINFORMATIONScheduleofSegmentdepreciationamortizationandimpairmentexpenseDetails">
        <link:definition>9955532 - Disclosure - SEGMENT INFORMATION - Schedule of Segment depreciation, amortization and impairment expense (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="SEGMENTINFORMATIONScheduleofSegmentAssetsDetails" roleURI="http://www.constellium.com/role/SEGMENTINFORMATIONScheduleofSegmentAssetsDetails">
        <link:definition>9955533 - Disclosure - SEGMENT INFORMATION - Schedule of Segment Assets (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="OTHERGAINSANDLOSSESNETDetails" roleURI="http://www.constellium.com/role/OTHERGAINSANDLOSSESNETDetails">
        <link:definition>9955534 - Disclosure - OTHER GAINS AND LOSSES - NET (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="FINANCECOSTSNETDetails" roleURI="http://www.constellium.com/role/FINANCECOSTSNETDetails">
        <link:definition>9955535 - Disclosure - FINANCE COSTS - NET (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="INCOMETAXDetails" roleURI="http://www.constellium.com/role/INCOMETAXDetails">
        <link:definition>9955536 - Disclosure - INCOME TAX (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.constellium.com/role/EARNINGSPERSHAREDetails">
        <link:definition>9955537 - 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="TRADERECEIVABLESANDOTHERScheduleoftradeandotherreceivablesDetails" roleURI="http://www.constellium.com/role/TRADERECEIVABLESANDOTHERScheduleoftradeandotherreceivablesDetails">
        <link:definition>9955538 - Disclosure - TRADE RECEIVABLES AND OTHER - Schedule of trade and other receivables (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="TRADERECEIVABLESANDOTHERNarrativeDetails" roleURI="http://www.constellium.com/role/TRADERECEIVABLESANDOTHERNarrativeDetails">
        <link:definition>9955539 - Disclosure - TRADE RECEIVABLES AND OTHER - 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="INVENTORIESDetails" roleURI="http://www.constellium.com/role/INVENTORIESDetails">
        <link:definition>9955540 - Disclosure - INVENTORIES (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="TRADEPAYABLESANDOTHERScheduleofcurrentandnoncurrentliabilitiesDetails" roleURI="http://www.constellium.com/role/TRADEPAYABLESANDOTHERScheduleofcurrentandnoncurrentliabilitiesDetails">
        <link:definition>9955541 - Disclosure - TRADE PAYABLES AND OTHER - Schedule of current and noncurrent 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="TRADEPAYABLESANDOTHERSummaryofmovementincontractwithcustomercontractliabilityDetails" roleURI="http://www.constellium.com/role/TRADEPAYABLESANDOTHERSummaryofmovementincontractwithcustomercontractliabilityDetails">
        <link:definition>9955542 - Disclosure - TRADE PAYABLES AND OTHER - Summary of movement in contract with customer, contract liability (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="DEBTScheduleofdebtinstrumentsDetails" roleURI="http://www.constellium.com/role/DEBTScheduleofdebtinstrumentsDetails">
        <link:definition>9955543 - Disclosure - DEBT - Schedule of debt instruments (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.constellium.com/role/DEBTNarrativeDetails">
        <link:definition>9955544 - 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="FINANCIALINSTRUMENTSScheduleofderivativesinstrumentspresentedatfairvalueintheConsolidatedBalanceSheetDetails" roleURI="http://www.constellium.com/role/FINANCIALINSTRUMENTSScheduleofderivativesinstrumentspresentedatfairvalueintheConsolidatedBalanceSheetDetails">
        <link:definition>9955545 - Disclosure - FINANCIAL INSTRUMENTS - Schedule of derivatives instruments presented at fair value in the Consolidated Balance Sheet (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="FINANCIALINSTRUMENTSScheduleoffairvaluehierarchyDetails" roleURI="http://www.constellium.com/role/FINANCIALINSTRUMENTSScheduleoffairvaluehierarchyDetails">
        <link:definition>9955546 - Disclosure - FINANCIAL INSTRUMENTS - Schedule of fair value hierarchy (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="FINANCIALINSTRUMENTSScheduleofnotionalamountsofoutstandingderivativesDetails" roleURI="http://www.constellium.com/role/FINANCIALINSTRUMENTSScheduleofnotionalamountsofoutstandingderivativesDetails">
        <link:definition>9955547 - Disclosure - FINANCIAL INSTRUMENTS - Schedule of notional amounts of outstanding derivatives (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="FINANCIALINSTRUMENTSNarrativeDetails" roleURI="http://www.constellium.com/role/FINANCIALINSTRUMENTSNarrativeDetails">
        <link:definition>9955548 - Disclosure - FINANCIAL INSTRUMENTS - 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="FINANCIALINSTRUMENTSScheduleofderivativesinstrumentsperformanceDetails" roleURI="http://www.constellium.com/role/FINANCIALINSTRUMENTSScheduleofderivativesinstrumentsperformanceDetails">
        <link:definition>9955549 - Disclosure - FINANCIAL INSTRUMENTS - Schedule of derivatives instruments performance (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="PENSIONANDOTHERPOSTEMPLOYMENTBENEFITOBLIGATIONSDetails" roleURI="http://www.constellium.com/role/PENSIONANDOTHERPOSTEMPLOYMENTBENEFITOBLIGATIONSDetails">
        <link:definition>9955550 - Disclosure - PENSION AND OTHER POST-EMPLOYMENT BENEFIT OBLIGATIONS (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="PROVISIONSDisclosureofdetailedinformationaboutprovisionsDetails" roleURI="http://www.constellium.com/role/PROVISIONSDisclosureofdetailedinformationaboutprovisionsDetails">
        <link:definition>9955551 - Disclosure - PROVISIONS - Disclosure of detailed information about provisions (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="PROVISIONSNarrativeDetails" roleURI="http://www.constellium.com/role/PROVISIONSNarrativeDetails">
        <link:definition>9955552 - Disclosure - PROVISIONS - 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="ACCUMULATEDOTHERCOMPREHENSIVEINCOMEDetails" roleURI="http://www.constellium.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMEDetails">
        <link:definition>9955553 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (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="SHAREBASEDCOMPENSATIONNarrativeDetails" roleURI="http://www.constellium.com/role/SHAREBASEDCOMPENSATIONNarrativeDetails">
        <link:definition>9955554 - Disclosure - SHARE-BASED COMPENSATION - 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="SHAREBASEDCOMPENSATIONScheduleofvaluationmodelusedforthePSUsgrantedDetails" roleURI="http://www.constellium.com/role/SHAREBASEDCOMPENSATIONScheduleofvaluationmodelusedforthePSUsgrantedDetails">
        <link:definition>9955555 - Disclosure - SHARE-BASED COMPENSATION - Schedule of valuation model used for the PSUs granted (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="ACQUISITIONANDDISPOSALOFSUBSIDIARIESDetails" roleURI="http://www.constellium.com/role/ACQUISITIONANDDISPOSALOFSUBSIDIARIESDetails">
        <link:definition>9955556 - Disclosure - ACQUISITION AND DISPOSAL OF SUBSIDIARIES (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.constellium.com/role/SUBSEQUENTEVENTSDetails">
        <link:definition>9955557 - 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>
    </xs:appinfo>
  </xs:annotation>
  <xs:element id="cstm_OtherOperatingAndNonoperatingGainsLosses" abstract="false" name="OtherOperatingAndNonoperatingGainsLosses" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_DerivativesAndOtherFinancialAssetsCurrent" abstract="false" name="DerivativesAndOtherFinancialAssetsCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_ReceivablesNetNoncurrent" abstract="false" name="ReceivablesNetNoncurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_AccruedProvisionsCurrent" abstract="false" name="AccruedProvisionsCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_AccruedProvisionsNoncurrent" abstract="false" name="AccruedProvisionsNoncurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_NumberOfAuthorizedSharesNotDisclosed" abstract="false" name="NumberOfAuthorizedSharesNotDisclosed" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:booleanItemType"/>
  <xs:element id="cstm_InterestDebtAndOtherExpensesNet" abstract="false" name="InterestDebtAndOtherExpensesNet" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_UnrealizedGainLossOnDerivativesAndForeignCurrencyTransactions" abstract="false" name="UnrealizedGainLossOnDerivativesAndForeignCurrencyTransactions" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_IncreaseDecreaseInProvisions" abstract="false" name="IncreaseDecreaseInProvisions" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_PensionAndOtherLongTermBenefitsPaid" abstract="false" name="PensionAndOtherLongTermBenefitsPaid" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_ProceedsFromPropertyPlantAndEquipmentGrantsReceived" abstract="false" name="ProceedsFromPropertyPlantAndEquipmentGrantsReceived" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_ProceedsFromDisposalsNetOfCash" abstract="false" name="ProceedsFromDisposalsNetOfCash" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_ContingenciesAndProvisionTextBlock" abstract="false" name="ContingenciesAndProvisionTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="cstm_BusinessCombinationAndDiscontinuedOperationsAbstract" abstract="true" name="BusinessCombinationAndDiscontinuedOperationsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="cstm_ScheduleOfOtherGainsAndLossesTableTextBlock" abstract="false" name="ScheduleOfOtherGainsAndLossesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="cstm_DisclosureOfDetailedInformationAboutProvisionsTableTextBlock" abstract="false" name="DisclosureOfDetailedInformationAboutProvisionsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="cstm_ScheduleOfShareBasedPaymentAwardPerformanceBasedRestrictedStockUnitsValuationAssumptionsTableTextBlock" abstract="false" name="ScheduleOfShareBasedPaymentAwardPerformanceBasedRestrictedStockUnitsValuationAssumptionsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="cstm_NumberOfProductionFacilities" abstract="false" name="NumberOfProductionFacilities" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="cstm_NumberOfWorldClassTechnologyCenters" abstract="false" name="NumberOfWorldClassTechnologyCenters" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="cstm_NumberOfAdministrativeAndCommercialSites" abstract="false" name="NumberOfAdministrativeAndCommercialSites" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="cstm_AerospaceRolledProductsMember" abstract="true" name="AerospaceRolledProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cstm_TransportationIndustryDefenseAndOtherRolledProductsMember" abstract="true" name="TransportationIndustryDefenseAndOtherRolledProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cstm_PackagingRolledProductsMember" abstract="true" name="PackagingRolledProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cstm_AutomotiveRolledProductsMember" abstract="true" name="AutomotiveRolledProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cstm_SpecialtyAndOtherThinRolledProductsMember" abstract="true" name="SpecialtyAndOtherThinRolledProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cstm_AutomotiveExtrudedProductsMember" abstract="true" name="AutomotiveExtrudedProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cstm_OtherExtrudedProductsMember" abstract="true" name="OtherExtrudedProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cstm_AerospaceAndTransportationMember" abstract="true" name="AerospaceAndTransportationMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cstm_PackagingAndAutomotiveRolledProductsMember" abstract="true" name="PackagingAndAutomotiveRolledProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cstm_AutomotiveStructuresAndIndustryMember" abstract="true" name="AutomotiveStructuresAndIndustryMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cstm_HoldingCorporateMember" abstract="true" name="HoldingCorporateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cstm_CostOfMetal" abstract="false" name="CostOfMetal" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_OtherExpensesIncludingSellingGeneralAdministrativeAndResearchAndDevelopmentCosts" abstract="false" name="OtherExpensesIncludingSellingGeneralAdministrativeAndResearchAndDevelopmentCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_AdjustedEarningsBeforeInterestTaxesDepreciationAndAmortization" abstract="false" name="AdjustedEarningsBeforeInterestTaxesDepreciationAndAmortization" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_FloodingOfFacilitiesValaisSwitzerlandMember" abstract="true" name="FloodingOfFacilitiesValaisSwitzerlandMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cstm_MetalPriceLagAdjustments" abstract="false" name="MetalPriceLagAdjustments" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_PensionAndOtherPostretirementBenefitCostNonOperatingGains" abstract="false" name="PensionAndOtherPostretirementBenefitCostNonOperatingGains" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_UnrealizedExchangeGainsLossesFromReMeasurementOfMonetaryAssetsAndLiabilitiesNet" abstract="false" name="UnrealizedExchangeGainsLossesFromReMeasurementOfMonetaryAssetsAndLiabilitiesNet" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_OtherAdjustments" abstract="false" name="OtherAdjustments" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_ExpensesOnFactoringArrangementsNonOperating" abstract="false" name="ExpensesOnFactoringArrangementsNonOperating" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_InsuranceProceedsFromCatastrophes" abstract="false" name="InsuranceProceedsFromCatastrophes" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_DepreciationAmortizationAndImpairmentCharge" abstract="false" name="DepreciationAmortizationAndImpairmentCharge" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_DerivativesAndOtherFinancialAssets" abstract="false" name="DerivativesAndOtherFinancialAssets" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_OperatingIncomeAndExpenseAbstract" abstract="true" name="OperatingIncomeAndExpenseAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="cstm_GainLossFromCatastrophes" abstract="false" name="GainLossFromCatastrophes" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_NonOperatingIncomeAndExpenseAbstract" abstract="true" name="NonOperatingIncomeAndExpenseAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="cstm_MiscellaneousOtherGainsLosses" abstract="false" name="MiscellaneousOtherGainsLosses" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_DefinedBenefitPlanInterestCostNetOfExpectedReturnOnPlanAssets" abstract="false" name="DefinedBenefitPlanInterestCostNetOfExpectedReturnOnPlanAssets" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_RealizedAndUnrealizedExchangeGainsLossesOnFinancingActivitiesNet" abstract="false" name="RealizedAndUnrealizedExchangeGainsLossesOnFinancingActivitiesNet" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_CapitalizedBorrowingCosts" abstract="false" name="CapitalizedBorrowingCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_PropertyPlantAndEquipmentInterestCapitalizationPercentage" abstract="false" name="PropertyPlantAndEquipmentInterestCapitalizationPercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="cstm_MaximumLimitsForAccountsReceivableFactoringArrangements" abstract="false" name="MaximumLimitsForAccountsReceivableFactoringArrangements" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_AccountsReceivablesUnderFactoringArrangementsDerecognizedAmountFactoringArrangements" abstract="false" name="AccountsReceivablesUnderFactoringArrangementsDerecognizedAmountFactoringArrangements" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_AccountsReceivablesUnderFactoringArrangementsDeferredPurchasePriceReceivable" abstract="false" name="AccountsReceivablesUnderFactoringArrangementsDeferredPurchasePriceReceivable" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_ProceedsFromCollectionOfDeferredPurchasePriceReceivable" abstract="false" name="ProceedsFromCollectionOfDeferredPurchasePriceReceivable" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_ContractWithCustomerLiabilityRollForward" abstract="true" name="ContractWithCustomerLiabilityRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="cstm_ContractWithCustomerLiabilityRevenueDeferredToContractLiabilities" abstract="false" name="ContractWithCustomerLiabilityRevenueDeferredToContractLiabilities" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_ContractWithCustomerLiabilityEffectOfChangesInForeignCurrencyRatesAndOtherChanges" abstract="false" name="ContractWithCustomerLiabilityEffectOfChangesInForeignCurrencyRatesAndOtherChanges" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_PanU.S.ABLFacilityMember" abstract="true" name="PanU.S.ABLFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cstm_ConstelliumSESeniorUnsecuredNotesIssuedJune2020DueJune2028325MillionMember" abstract="true" name="ConstelliumSESeniorUnsecuredNotesIssuedJune2020DueJune2028325MillionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cstm_ConstelliumSESeniorUnsecuredNotesIssuedFebruary2021Due2029500MillionMember" abstract="true" name="ConstelliumSESeniorUnsecuredNotesIssuedFebruary2021Due2029500MillionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cstm_ConstelliumSESeniorUnsecuredNotesIssuedJune2021Due2029300MillionMember" abstract="true" name="ConstelliumSESeniorUnsecuredNotesIssuedJune2021Due2029300MillionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cstm_ConstelliumSESeniorUnsecuredNotesIssuedAugust2024Due2032350MillionMember" abstract="true" name="ConstelliumSESeniorUnsecuredNotesIssuedAugust2024Due2032350MillionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cstm_ConstelliumSESeniorUnsecuredNotesIssuedAugust2024Due2032300MillionMember" abstract="true" name="ConstelliumSESeniorUnsecuredNotesIssuedAugust2024Due2032300MillionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cstm_ShortTermAndLongTermLoansMember" abstract="true" name="ShortTermAndLongTermLoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cstm_BorrowingsInterestAccrued" abstract="false" name="BorrowingsInterestAccrued" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_FinanceLeaseFaceValue" abstract="false" name="FinanceLeaseFaceValue" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_FinanceLeaseArrangementFees" abstract="false" name="FinanceLeaseArrangementFees" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_InterestAccruedOnLeaseLiabilities" abstract="false" name="InterestAccruedOnLeaseLiabilities" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_FrenchInventoryFacilityMember" abstract="true" name="FrenchInventoryFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cstm_LongTermDebtFairValueInPercentageOfFaceValue" abstract="false" name="LongTermDebtFairValueInPercentageOfFaceValue" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="cstm_ForeignExchangeContractCommercialDerivativesMember" abstract="true" name="ForeignExchangeContractCommercialDerivativesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cstm_CommodityDerivativesMetalNettingMember" abstract="true" name="CommodityDerivativesMetalNettingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cstm_MaturityAxis" abstract="true" name="MaturityAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="cstm_MaturityDomain" abstract="true" name="MaturityDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cstm_NotLaterThanOneYearMember" abstract="true" name="NotLaterThanOneYearMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cstm_LaterThanOneYearMember" abstract="true" name="LaterThanOneYearMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cstm_EURUSDCurrencyForwardDerivativeMember" abstract="true" name="EURUSDCurrencyForwardDerivativeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cstm_EURCHFCurrencyForwardDerivativeMember" abstract="true" name="EURCHFCurrencyForwardDerivativeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cstm_EURCZKCurrencyForwardDerivativeMember" abstract="true" name="EURCZKCurrencyForwardDerivativeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cstm_EUROtherCurrenciesCurrencyForwardDerivativeMember" abstract="true" name="EUROtherCurrenciesCurrencyForwardDerivativeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cstm_NaturalGasDerivativeNettingMember" abstract="true" name="NaturalGasDerivativeNettingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cstm_ForeignExchangeContractNetDebtDerivativesMember" abstract="true" name="ForeignExchangeContractNetDebtDerivativesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cstm_RealizedGainLossOnDerivativesNet" abstract="false" name="RealizedGainLossOnDerivativesNet" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_OtherPostEmploymentBenefitsAndOtherLongTermBenefitMember" abstract="true" name="OtherPostEmploymentBenefitsAndOtherLongTermBenefitMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cstm_ProvisionsCurrentAbstract" abstract="true" name="ProvisionsCurrentAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="cstm_ProvisionsForLegalClaimsAndOtherCostsCurrent" abstract="false" name="ProvisionsForLegalClaimsAndOtherCostsCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_ProvisionsNonCurrentAbstract" abstract="true" name="ProvisionsNonCurrentAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="cstm_ProvisionsForLegalClaimsAndOtherCostsNonCurrent" abstract="false" name="ProvisionsForLegalClaimsAndOtherCostsNonCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_ProvisionsExpectedSettlementPeriod" abstract="false" name="ProvisionsExpectedSettlementPeriod" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="cstm_ReclassificationFromAccumulatedOtherComprehensiveIncomeToRetainedEarningsCurrentPeriodNetOfTax" abstract="false" name="ReclassificationFromAccumulatedOtherComprehensiveIncomeToRetainedEarningsCurrentPeriodNetOfTax" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="cstm_PercentageOfShareBasedPaymentsVestingMultiplier" abstract="false" name="PercentageOfShareBasedPaymentsVestingMultiplier" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="cstm_ChangchunEngleyAutomobilePartsCoLtdChangchunMember" abstract="true" name="ChangchunEngleyAutomobilePartsCoLtdChangchunMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="cstm_DisposalGroupIncludingDiscontinuedOperationOwnershipPercentageInDisposedAsset" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationOwnershipPercentageInDisposedAsset" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
</xs:schema>
