-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 B0ZRFOysxlP4VM1tSpXhqho34GprCi5e/Au4fMkZHf4Ss3H/3n+B7zsp5vzln9h5
 eXqVo3ViymTNDpH4x5s3EA==

<SEC-DOCUMENT>0001140361-10-013522.txt : 20100324
<SEC-HEADER>0001140361-10-013522.hdr.sgml : 20100324
<ACCEPTANCE-DATETIME>20100324174241
ACCESSION NUMBER:		0001140361-10-013522
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20100322
FILED AS OF DATE:		20100324
DATE AS OF CHANGE:		20100324

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Leatherberry William J
		CENTRAL INDEX KEY:			0001422024

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-34474
		FILM NUMBER:		10702705

	MAIL ADDRESS:	
		STREET 1:		C/O CENTURY ALUMINUM COMPANY
		STREET 2:		2511 GARDEN ROAD, BLDG A, SUITE 200
		CITY:			MONTEREY
		STATE:			CA
		ZIP:			93940

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CENTURY ALUMINUM CO
		CENTRAL INDEX KEY:			0000949157
		STANDARD INDUSTRIAL CLASSIFICATION:	PRIMARY PRODUCTION OF ALUMINUM [3334]
		IRS NUMBER:				133070826
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0319

	BUSINESS ADDRESS:	
		STREET 1:		2511 GARDEN ROAD
		STREET 2:		BUILDING A SUITE 200
		CITY:			MONTEREY
		STATE:			CA
		ZIP:			93940
		BUSINESS PHONE:		3042736000

	MAIL ADDRESS:	
		STREET 1:		2511 GARDEN ROAD
		STREET 2:		BUILDING A SUITE 200
		CITY:			MONTEREY
		STATE:			CA
		ZIP:			93940
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>doc1.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2010-03-22</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000949157</issuerCik>
        <issuerName>CENTURY ALUMINUM CO</issuerName>
        <issuerTradingSymbol>CENX</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001422024</rptOwnerCik>
            <rptOwnerName>Leatherberry William J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>CENTURY ALUMINUM COMPANY</rptOwnerStreet1>
            <rptOwnerStreet2>2511 GARDEN ROAD, BLDG. A, SUITE 200</rptOwnerStreet2>
            <rptOwnerCity>MONTEREY</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>93940</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>EVP, Gen. Counsel &amp; Secretary</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2010-03-22</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>9960</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>53215</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>187.2748</value>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>401(k)</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Represents unvested shares of performance share units granted to the Reporting Person in connection with the Issuer's 2010-2012 Performance Share Program Period (&quot;Plan Period&quot;) under a Rule 16b-3(d) plan, all of which vest in the ordinary course on the last day of the Plan Period, December 31, 2012.</footnote>
        <footnote id="F2">Includes unvested shares of performance share units granted to the Reporting Person in connection with the Issuer's 2008-2010 and 2009-2011 Performance Share Program Periods under a rule 16b-3(d) plan, all of which vest in the ordinary course on December 31, 2010 and January 1, 2011, respectively.</footnote>
        <footnote id="F3">Reported by 401(k) plan trustee on March 22, 2010.</footnote>
    </footnotes>

    <remarks>Exhibit List

Exhibit 24.1 - Power of Attorney</remarks>

    <ownerSignature>
        <signatureName>Jesse E. Gary, Attorney-in-Fact for William J. Leatherberry</signatureName>
        <signatureDate>2010-03-24</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24.1
<SEQUENCE>2
<FILENAME>poa1.htm
<DESCRIPTION>POWER OF ATTORNEY
<TEXT>
<html>
<head>
    <title>Unassociated Document</title>
    <!--Licensed to: century aluminum company-->
    <!--Document Created using EDGARizer2020 5.1.5.0-->
    <!--Copyright 1995 - 2009 Thomson Reuters. All rights reserved.-->
</head>
<body bgcolor="#ffffff" style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt"><br>
    <div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt; FONT-WEIGHT: bold">POWER
OF ATTORNEY</font><br></div>
    <div style="TEXT-INDENT: 0pt; DISPLAY: block"><br></div>
    <div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">KNOW ALL
BY THESE PRESENTS, that the undersigned hereby constitutes and appoints Jesse E.
Gary, signing singly, the undersigned's true and lawful attorney-in-fact
to:</font></div>
    <div style="LINE-HEIGHT: 1; TEXT-INDENT: 0pt; DISPLAY: block"><br></div>
    <div style="LINE-HEIGHT: 1; TEXT-INDENT: 0pt; DISPLAY: block"><br></div>
    <div style="LINE-HEIGHT: 1; TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 36pt; MARGIN-RIGHT: 36pt" align="justify"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">(1)&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;execute
for and on behalf of the undersigned, in the undersigned's capacity as an
officer and/or director of Century Aluminum Company (the &#8220;Company&#8221;), all filings
in accordance with the Securities Exchange Act of 1934 and the rules
thereunder;</font></div>
    <div style="LINE-HEIGHT: 1; TEXT-INDENT: 0pt; DISPLAY: block"><br></div>
    <div style="LINE-HEIGHT: 1; TEXT-INDENT: 0pt; DISPLAY: block"><br></div>
    <div style="LINE-HEIGHT: 1; TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 36pt; MARGIN-RIGHT: 36pt" align="justify"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">(2)&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;do
and perform any and all acts for and on behalf of the undersigned which may be
necessary or desirable to complete and execute any such filings in accordance
with the Securities Exchange Act of 1934 and the rules thereunder, complete and
execute any amendment or amendments thereto, and timely file such filings with
the United States Securities and Exchange Commission and any stock exchange or
similar authority; and</font></div>
    <div style="LINE-HEIGHT: 1; TEXT-INDENT: 0pt; DISPLAY: block"><br></div>
    <div style="LINE-HEIGHT: 1; TEXT-INDENT: 0pt; DISPLAY: block"><br></div>
    <div style="LINE-HEIGHT: 1; TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 36pt; MARGIN-RIGHT: 36pt" align="justify"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">(3)&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;take
any other action of any type whatsoever in connection with the foregoing which,
in the opinion of such attorney-in-fact, may be of benefit to, in the best
interest of, or legally required by, the undersigned, it being understood that
the documents executed by such attorney-in-fact on behalf of the undersigned
pursuant to this Power of Attorney shall be in such form and shall contain such
terms and conditions as such attorney-in-fact may approve in such
attorney-in-fact's discretion.</font></div>
    <div style="LINE-HEIGHT: 1; TEXT-INDENT: 0pt; DISPLAY: block"><br></div>
    <div style="LINE-HEIGHT: 1; TEXT-INDENT: 0pt; DISPLAY: block"><br></div>
    <div style="LINE-HEIGHT: 1; TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt"><font id="TAB1" style="MARGIN-LEFT: 36pt"></font>The undersigned hereby grants to the
attorney-in-fact full power and authority to do and perform any and every act
and thing whatsoever requisite, necessary, or proper to be done in the exercise
of any of the rights and powers herein granted, as fully to all intents and
purposes as the undersigned might or could do if personally present, with full
power of substitution or revocation, hereby ratifying and confirming all that
such attorney-in-fact, or such attorney-in-fact's substitute or substitutes,
shall lawfully do or cause to be done by virtue of this power of attorney and
the rights and powers herein granted.&#160;&#160;The undersigned acknowledges
that the foregoing attorneys-in-fact, in serving in such capacity at the request
of the undersigned, are not assuming, nor is the Company assuming, any of the
undersigned's responsibilities to comply with the Securities Exchange Act of
1934.</font></div>
    <div style="LINE-HEIGHT: 1; TEXT-INDENT: 0pt; DISPLAY: block"><br>&#160;</div>
    <div style="TEXT-INDENT: 36pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">This
Power of Attorney shall remain in full force and effect until the undersigned is
no longer required to execute such filings in accordance with the Securities
Exchange Act of 1934 and the rules thereunder, unless earlier revoked by the
undersigned in a signed writing delivered to the foregoing
attorneys-in-fact.</font></div>
    <div style="TEXT-INDENT: 0pt; DISPLAY: block"><br></div>
    <div style="TEXT-INDENT: 0pt; DISPLAY: block"><br></div>
    <div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">IN
WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this 16th day of March, 2010.</font><br></div>
    <div>&#160;</div>
    <div align="left">
      <table bgcolor="white" cellpadding="0" cellspacing="0" width="30%" style="FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">
<tr>
            <td width="100%" style="BORDER-BOTTOM: black 2px solid"><font style="FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;/s/ William J.
      Leatherberry</font></td>
          </tr><tr>
            <td width="100%"><font style="FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;Signature</font></td>
          </tr><tr>
            <td width="100%">
              <div><font style="FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;</font></div>
              <div>&#160;</div>
            </td>
          </tr><tr>
            <td width="100%" style="BORDER-BOTTOM: black 2px solid"><font style="FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;William J.
      Leatherberry</font></td>
          </tr><tr>
            <td width="100%"><font style="FONT-FAMILY: times new roman; FONT-SIZE: 10pt">&#160;Print
      Name</font></td>
          </tr></table>
    </div>
  </body>
</html>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----
