<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
  <headerData>
    <submissionType>144</submissionType>
    <filerInfo>
      <filer>
        <filerCredentials>
          <cik>0001846594</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
  </headerData>
  <formData>
    <issuerInfo>
      <issuerCik>0000949157</issuerCik>
      <issuerName>CENTURY ALUMINUM CO</issuerName>
      <secFileNumber>001-34474</secFileNumber>
      <issuerAddress>
        <com:street1>1 SOUTH WACKER DRIVE</com:street1>
        <com:street2>SUITE 1000</com:street2>
        <com:city>CHICAGO</com:city>
        <com:stateOrCountry>IL</com:stateOrCountry>
        <com:zipCode>60606</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>3126963101</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Gudlaugsson Gunnar</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Officer</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>Charles Schwab Corp</name>
        <address>
          <com:street1>3000 Schwab Way</com:street1>
          <com:city>Westlake</com:city>
          <com:stateOrCountry>TX</com:stateOrCountry>
          <com:zipCode>76262</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>20000</noOfUnitsSold>
      <aggregateMarketValue>479000.00</aggregateMarketValue>
      <noOfUnitsOutstanding>92798844</noOfUnitsOutstanding>
      <approxSaleDate>12/05/2024</approxSaleDate>
      <securitiesExchangeName>Nasdaq</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>12/31/2023</acquiredDate>
      <natureOfAcquisitionTransaction>Restricted Stock Unit</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>20000</amountOfSecuritiesAcquired>
      <paymentDate>12/31/2023</paymentDate>
      <natureOfPayment>Equity Compensation</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <noticeSignature>
      <noticeDate>12/05/2024</noticeDate>
      <signature>Gunnar Gudlaugsson</signature>
    </noticeSignature>
  </formData>
</edgarSubmission>
[{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 2759}]
144
0001846594
XXXXXXXX
LIVE
0000949157
CENTURY ALUMINUM CO
001-34474
1 SOUTH WACKER DRIVE
SUITE 1000
CHICAGO
IL
60606
3126963101
Gudlaugsson Gunnar
Officer
Common
Charles Schwab Corp
3000 Schwab Way
Westlake
TX
76262
20000
479000.00
92798844
12/05/2024
Nasdaq
Common
12/31/2023
Restricted Stock Unit
Issuer
N
20000
12/31/2023
Equity Compensation
Y
12/05/2024
Gunnar Gudlaugsson