<ownershipDocument>
    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType>
<periodOfReport>2004-01-08</periodOfReport>
<notSubjectToSection16>0</notSubjectToSection16>
    <issuer>
        <issuerCik>0000002491</issuerCik>
        <issuerName>ALLIANCE GAMING CORP</issuerName>
        <issuerTradingSymbol>agi</issuerTradingSymbol>
</issuer>
<reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001201647</rptOwnerCik>
            <rptOwnerName>HADDRILL RICHARD M</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>6601 S. BERMUDA ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>LAS VEGAS</rptOwnerCity>
            <rptOwnerState>NV</rptOwnerState>
            <rptOwnerZipCode>89119</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
<isDirector>1</isDirector>
<isOfficer>0</isOfficer>
<isTenPercentOwner>0</isTenPercentOwner>
<isOther>0</isOther>
<officerTitle></officerTitle>
<otherText></otherText>
</reportingOwnerRelationship>
</reportingOwner>
<nonDerivativeTable></nonDerivativeTable>
<derivativeTable><derivativeTransaction><securityTitle><value>Employee Stock Options (right to buy)</value>
</securityTitle>
<conversionOrExercisePrice><value>24.65</value>
</conversionOrExercisePrice>
<transactionDate><value>2004-01-08</value>
</transactionDate>
<transactionCoding><transactionFormType>4</transactionFormType>
<transactionCode>A</transactionCode>
<equitySwapInvolved>0</equitySwapInvolved>
</transactionCoding>
<transactionAmounts><transactionShares><value>195000</value>
</transactionShares>
<transactionPricePerShare><value>24.65</value>
</transactionPricePerShare>
<transactionAcquiredDisposedCode><value>A</value>
</transactionAcquiredDisposedCode>
</transactionAmounts>
<exerciseDate><footnoteId id="F1"></footnoteId>
</exerciseDate>
<expirationDate><footnoteId id="F1"></footnoteId>
</expirationDate>
<underlyingSecurity><underlyingSecurityTitle><value>Common Stock $0.10 peer par value per share</value>
</underlyingSecurityTitle>
<underlyingSecurityShares><value>195000</value>
</underlyingSecurityShares>
</underlyingSecurity>
<postTransactionAmounts><sharesOwnedFollowingTransaction><value>195000</value>
</sharesOwnedFollowingTransaction>
</postTransactionAmounts>
<ownershipNature><directOrIndirectOwnership><value>D</value>
</directOrIndirectOwnership>
</ownershipNature>
</derivativeTransaction>
</derivativeTable>
<footnotes><footnote id="F1">These options vest in four equal tranches of 48,750 shares each, vesting if on or before January 8, 2009 the average closing stock price for twenty consecutive days exceeds $35 for the first tranche, $40 for the second, $45 for the third, and $50 for the fourth.  Any options not vested as of January 8, 2009, will vest on January 8, 2011, and will remain exercisable thereafter only until April 8, 2011, subject to extension for the length of any "blackout" period during which directors and officers are not permitted to sell the Company's stock.  These options are granted in lieu of the threee grants of immediately-vesting ten-year options of 30,000 shares each (for a total of 90,000 shares) that would otherwise have been granted on the dates of the annual shareholder meetings in 2003, 2004 and 2005, and which Mr. Haddrill has agreed to forego.</footnote>
</footnotes>
<ownerSignature><signatureName>Richard Haddrill</signatureName>
<signatureDate>2004-01-12</signatureDate>
</ownerSignature>
</ownershipDocument>

