<?xml version="1.0"?>
<ownershipDocument>
    <schemaVersion>X0201</schemaVersion>

    <documentType>3</documentType>
<periodOfReport>2003-08-19</periodOfReport>
    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000938113</issuerCik>
        <issuerName>APOLLO GOLD CORP</issuerName>
        <issuerTradingSymbol>AGT (+)</issuerTradingSymbol>
</issuer>
<reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001260944</rptOwnerCik>
            <rptOwnerName>WATTS ROBERT A</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>204 BLACK STREET</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 300</rptOwnerStreet2>
            <rptOwnerCity>WHITEHORSE</rptOwnerCity>
            <rptOwnerState>B0</rptOwnerState>
            <rptOwnerZipCode>Y1A 2M9</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
<isDirector>1</isDirector>
<isOfficer>0</isOfficer>
<isTenPercentOwner>0</isTenPercentOwner>
<isOther>0</isOther>
<officerTitle></officerTitle>
<otherText></otherText>
</reportingOwnerRelationship>
</reportingOwner>
<nonDerivativeTable>
<nonDerivativeHolding>
<securityTitle>
<value>Common Stock</value>
</securityTitle>
<postTransactionAmounts>
<sharesOwnedFollowingTransaction>
<value>0</value>
</sharesOwnedFollowingTransaction>
</postTransactionAmounts>
<ownershipNature>
<directOrIndirectOwnership>
<value>D</value>
</directOrIndirectOwnership>
<natureOfOwnership>
<value></value>
</natureOfOwnership>
</ownershipNature>
</nonDerivativeHolding>
</nonDerivativeTable>
<derivativeTable>
<derivativeHolding>
<securityTitle>
<value>EMPLOYEE STOCK OPTIONS (Right to buy)</value>
</securityTitle>
<conversionOrExercisePrice>
<value>2.24</value>
<footnoteId id="F1"/>
</conversionOrExercisePrice>
<exerciseDate>
<value>2003-12-31</value>
</exerciseDate>
<expirationDate>
<value>2013-08-22</value>
</expirationDate>
<underlyingSecurity>
<underlyingSecurityTitle>
<value>COMMON STOCK</value>
</underlyingSecurityTitle>
<underlyingSecurityShares>
<value>35000</value>
</underlyingSecurityShares>
</underlyingSecurity>
<ownershipNature>
<directOrIndirectOwnership>
<value>D</value>
</directOrIndirectOwnership>
<natureOfOwnership>
<value></value>
</natureOfOwnership>
</ownershipNature>
</derivativeHolding>
<derivativeHolding>
<securityTitle>
<value>EMPLOYEE STOCK OPTIONS (Right to buy)</value>
</securityTitle>
<conversionOrExercisePrice>
<value>2.24</value>
<footnoteId id="F1"/>
</conversionOrExercisePrice>
<exerciseDate>
<value>2004-12-31</value>
</exerciseDate>
<expirationDate>
<value>2013-08-22</value>
</expirationDate>
<underlyingSecurity>
<underlyingSecurityTitle>
<value>COMMON STOCK</value>
</underlyingSecurityTitle>
<underlyingSecurityShares>
<value>35000</value>
</underlyingSecurityShares>
</underlyingSecurity>
<ownershipNature>
<directOrIndirectOwnership>
<value>D</value>
</directOrIndirectOwnership>
<natureOfOwnership>
<value></value>
</natureOfOwnership>
</ownershipNature>
</derivativeHolding>
</derivativeTable>
<footnotes>
<footnote id="F1">Exercise price is based on conversion from Canadian to US dollars on the last business day prior to the date of grant.</footnote>
</footnotes>
<remarks>(+)  Issuer has the additional trading symbol of TSX:APG.</remarks>
<ownerSignature>
<signatureName>Robert A. Watts</signatureName>
<signatureDate>2003-08-26</signatureDate>
</ownerSignature>
</ownershipDocument>

