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

    <schemaVersion>X0202</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2006-09-01</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000002491</issuerCik>
        <issuerName>BALLY TECHNOLOGIES, INC.</issuerName>
        <issuerTradingSymbol>BYI</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001373193</rptOwnerCik>
            <rptOwnerName>Isaacs Michael Gavin</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>6601 BERMUDA ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>LAS VEGAS</rptOwnerCity>
            <rptOwnerState>NV</rptOwnerState>
            <rptOwnerZipCode>89119</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>EVP &amp; COO</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Bally Technologies,Inc.Common Stock,$.10 par value per share</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>50000</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Employee Stock Options (Right To Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>15.73</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <value>2016-09-01</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock, $.10 par value per share</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>150000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Grant of restricted stock pursuant to the Employment Agreement by and between Bally Technologies, Inc. (the &quot;Company&quot;) and Michael Gavin Isaacs, dated as of June 19, 2006.  Per the terms of the Employment Agreement, the restricted stock shall vest as follows: (i) 25,000 shares vest on September 1, 2008, (ii) 12,500 shares vest on September 1, 2009 and (iii) 12,500 shares vest on September 1, 2010, in each case subject to Mr. Isaacs' continuous employment as the Company's Executive Vice President and Chief Operating Officer through each such date.</footnote>
        <footnote id="F2">Per the terms of the Employment Agreement, the 150,000 options shall vest in four equal installments of 37,500 options on the following dates: (i) September 1, 2007, (ii) September 1, 2008, (iii) September 1, 2009 and (iv) September 1, 2010, in each case subject to Mr Isaacs'; continuous employment as the Company's Executive Vice President and Chief Operating Officer through each such date.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Michael Gavin Isaacs</signatureName>
        <signatureDate>2006-09-06</signatureDate>
    </ownerSignature>
</ownershipDocument>
