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

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2006-06-20</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000002491</issuerCik>
        <issuerName>BALLY TECHNOLOGIES, INC.</issuerName>
        <issuerTradingSymbol>BYI</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>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Executive Officer</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Bally Technologies,Inc.Common Stock,$.10 par value per share</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <transactionDate>
                <value>2006-06-20</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>92565</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>695102</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Employee Stock Options (Right To Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>14.77</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2006-06-20</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>200000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F3"/>
            </exerciseDate>
            <expirationDate>
                <value>2016-06-20</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock, $.10 par value per share</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>200000</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>200000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Grant of restricted stock pursuant to the Third Amendment to the Employment Agreement by and between Bally Technologies, Inc. (the &quot;Company&quot;) and Richard Haddrill, dated as of June 20, 2006 (the &quot;Amendment&quot;).  Per the terms of the Amendment, the restricted stock shall vest as follows:  (i) 28.6% thereof or 26,474 shares vest on July 1, 2008 and (ii) 71.4% thereof or 66,091 shares vest on January 1, 2009, in each case subject to Mr. Haddrill's continuous employment as the Company's Chief Executive Officer through each such date.</footnote>
        <footnote id="F2">Granted as compensation for services under the Company's Amended and Restated 2001 Long Term Incentive Plan, as amended.</footnote>
        <footnote id="F3">Per the terms of the Amendment, the options shall vest as follows:(i) 66,667 shares vest on February 28, 2008, (ii) 66,667 shares vest on July 31, 2008, and (iii) 66,666 shares vest on January 1, 2009, in each case subject to Mr. Haddrill's continuous employment as the Company's Chief Executive Officer through each such date.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Richard Haddrill</signatureName>
        <signatureDate>2006-06-22</signatureDate>
    </ownerSignature>
</ownershipDocument>
