<SEC-DOCUMENT>0000949157-15-000095.txt : 20150902
<SEC-HEADER>0000949157-15-000095.hdr.sgml : 20150902
<ACCEPTANCE-DATETIME>20150902162430
ACCESSION NUMBER:		0000949157-15-000095
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20150831
FILED AS OF DATE:		20150902
DATE AS OF CHANGE:		20150902

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:			1231

	BUSINESS ADDRESS:	
		STREET 1:		1 SOUTH WACKER DRIVE
		STREET 2:		SUITE 1000
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60606
		BUSINESS PHONE:		3126963101

	MAIL ADDRESS:	
		STREET 1:		1 SOUTH WACKER DRIVE
		STREET 2:		SUITE 1000
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60606

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Michelmore Andrew G
		CENTRAL INDEX KEY:			0001493775

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-34474
		FILM NUMBER:		151089821

	MAIL ADDRESS:	
		STREET 1:		LEVEL 23/28 FRESHWATER PLACE
		STREET 2:		P.O. BOX 19421
		CITY:			SOUTHBANK VICTORIA
		STATE:			C3
		ZIP:			3006
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>wf-form4_144122546006214.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2015-08-31</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001493775</rptOwnerCik>
            <rptOwnerName>Michelmore Andrew G</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O CENTURY ALUMINUM COMPANY</rptOwnerStreet1>
            <rptOwnerStreet2>1 SOUTH WACKER DRIVE, SUITE 1000</rptOwnerStreet2>
            <rptOwnerCity>CHICAGO</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60606</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2015-08-31</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>2419</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>5.60</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>27429</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Represents shares withheld by the Issuer in connection with the vesting of grant of Performance Shares made to the Reporting Person pursuant to a Rule 16b-3(d) plan to satisfy tax obligations at a settlement price equal to the closing price on Nasdaq on August 31, 2015, the vesting date.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Jesse E. Gary, attorney-fact for Andrew G. Michelmore</signatureName>
        <signatureDate>2015-09-02</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>michelmore-poa.txt
<DESCRIPTION>POWER OF ATTORNEY AUTHORIZING JEG TO SIGN SECTION FILINGS ON BEHALF OF AM
<TEXT>
POWER OF ATTORNEY


    KNOW ALL BY THESE PRESENTS, that the undersigned hereby
constitutes and appoints each of Jesse E. Gary and Michael A.
Serafini, signing singly, the undersigned's true and lawful
attorney-in-fact to:

    (1)    execute for and on behalf of the undersigned,
        in the undersigned's capacity as an officer and/or
        director of Century Aluminum Company (the
        "Company"), all filings in accordance with the
        Securities Exchange Act of 1934 and the rules
        thereunder;

    (2)    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

    (3)    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.


    The undersigned hereby grants to each such 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.  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.


    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.


    IN WITNESS WHEREOF, the undersigned has caused this Power of
Attorney to be executed as of this 19th day of March, 2013.


/s/ Andrew Michelmore
Signature



Andrew Michelmore
Print Name
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
