<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0204</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2011-10-31</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001527705</issuerCik>
        <issuerName>ALST Casino Holdco, LLC</issuerName>
        <issuerTradingSymbol>N/A</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001542591</rptOwnerCik>
            <rptOwnerName>North LV HoldCo, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>650 MADISON AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2>23RD FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>See Remarks</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001542590</rptOwnerCik>
            <rptOwnerName>Standard General Gaming, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>650 MADISON AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2>23RD FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>See Footnote 3</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001418202</rptOwnerCik>
            <rptOwnerName>Kim Soohyung</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>650 MADISON AVENUE, 23RD FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>See Footnote 3</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001326580</rptOwnerCik>
            <rptOwnerName>Singer Nicholas J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>650 MADISON AVENUE, 23RD FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>See Footnote 3</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Units</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>123828</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">These securities are held by North LV HoldCo, LLC (&quot;HoldCo&quot;).  Standard General Gaming, LLC (&quot;Standard General Gaming&quot; and, together with HoldCo, the &quot;Reporting Entities&quot;) is the voting member of  HoldCo, and Messrs. Kim and Singer are co-managing members of Standard General Gaming.  HoldCo, Standard General Gaming and Messrs. Kim and Singer are referred to herein as the &quot;Reporting Persons.&quot;</footnote>
        <footnote id="F2">In their capacities described in Footnote 1, Standard General Gaming and Messrs. Kim and Singer may be deemed to beneficially own indirectly the securities reported herein. Each Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of its or his pecuniary interest therein, and the inclusion of such securities in this report shall not be deemed an admission of beneficial ownership for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (&quot;Section 16&quot;), or for any other purpose.</footnote>
    </footnotes>

    <remarks>Mr. Kim is Chief Executive Officer and is a member of the Board of Managers of the Issuer (see remarks below).  Mr. Singer was Chief Financial Officer of the Issuer as of October 31, 2011, but no longer serves in such capacity as of the date of filing of this report.

Mr. Kim is a member of the Board of Managers of the Issuer. The Reporting Entities take the position that they are to be deemed directors of the Issuer for purposes of Section 16, because Mr. Kim, directly or indirectly, has the power to control the investment and voting decisions of the Reporting Entities with respect to the Issuer's securities and because Mr. Kim initially became a member of the Board of Managers of the Issuer, in part, as a result of HoldCo's right, under the Issuer's Operating Agreement, to designate a member of the Board of Managers.</remarks>

    <ownerSignature>
        <signatureName>/s/ North LV HoldCo, LLC, by Standard General Gaming, LLC, Voting Member, by Soohyung Kim, Manager</signatureName>
        <signatureDate>2012-02-28</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Standard General Gaming, LLC, by Soohyung Kim, Manager</signatureName>
        <signatureDate>2012-02-28</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Soohyung Kim</signatureName>
        <signatureDate>2012-02-28</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Nicholas J. Singer</signatureName>
        <signatureDate>2012-02-28</signatureDate>
    </ownerSignature>
</ownershipDocument>
