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

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2026-02-03</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001859392</issuerCik>
        <issuerName>Galaxy Digital Inc.</issuerName>
        <issuerTradingSymbol>GLXY</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0002053086</rptOwnerCik>
            <rptOwnerName>Brown Erin Elizabeth</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O GALAXY DIGITAL INC.</rptOwnerStreet1>
            <rptOwnerStreet2>300 VESEY STREET</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10282</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chief Operating Officer</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2026-02-03</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>97497</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>295585</value>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Represents 97,497 shares of Class A common stock issuable upon the vesting of restricted stock units (&quot;RSUs&quot;).</footnote>
        <footnote id="F2">Each RSU represents the right to receive one share of the Company's Class A common stock.</footnote>
        <footnote id="F3">Includes 295,585 shares of Class A common stock to be delivered in settlement of RSUs.  An RSU award was granted on March 29, 2023 where 70,881 are scheduled to vest on March 1, 2026. An RSU award was granted on March 27, 2024 where 36,630 are scheduled to vest on March 1, 2026 and 37,740 are scheduled to vest on March 1, 2027. 52,837 RSUs were granted on March 31, 2025 where 17,613 are scheduled to vest on March 1, 2026 and the remainder are scheduled to vest in eight equal quarterly installments thereafter.  97,497 RSUs were granted on February 3, 2026, where  32,174 RSUs are schedule to vest on March 1, 2027 and the remainder in eight equal quarterly installments thereafter. The RSU awards, in each case, are subject to continued service through the applicable vesting date.</footnote>
    </footnotes>

    <remarks>Exhibits - Exhibit 24 - Power of Attorney</remarks>

    <ownerSignature>
        <signatureName>/s/ Frances Fuqua, Attorney-in-Fact for Erin Brown</signatureName>
        <signatureDate>2026-02-05</signatureDate>
    </ownerSignature>
</ownershipDocument>
