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

    <schemaVersion>X0204</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2011-10-13</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001511737</issuerCik>
        <issuerName>Ubiquiti Networks, Inc.</issuerName>
        <issuerTradingSymbol>UBNT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000830588</rptOwnerCik>
            <rptOwnerName>SUMMIT PARTNERS L P</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>222 BERKELEY STREET</rptOwnerStreet1>
            <rptOwnerStreet2>18TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02116</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <officerTitle></officerTitle>
            <otherText>Manager of GP of 10% owner.</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001486419</rptOwnerCik>
            <rptOwnerName>Summit Partners PE VII, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O SUMMIT PARTNERS, L.P.</rptOwnerStreet1>
            <rptOwnerStreet2>222 BERKELEY STREET, 18TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02110</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <officerTitle></officerTitle>
            <otherText>Manager of GP of 10% owner.</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001486418</rptOwnerCik>
            <rptOwnerName>Summit Partners PE VII, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O SUMMIT PARTNERS, L.P.</rptOwnerStreet1>
            <rptOwnerStreet2>222 BERKELEY STREET, 18TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02110</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <officerTitle></officerTitle>
            <otherText>Manager of GP of 10% owner.</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001507545</rptOwnerCik>
            <rptOwnerName>Summit Investors Management, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O SUMMIT PARTNERS, L.P.</rptOwnerStreet1>
            <rptOwnerStreet2>222 BERKELEY STREET, 18TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02110</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <officerTitle></officerTitle>
            <otherText>Manager of GP of 10% owner.</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001018067</rptOwnerCik>
            <rptOwnerName>MANNION MARTIN J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O SUMMIT PARTNERS, L.P.</rptOwnerStreet1>
            <rptOwnerStreet2>222 BERKELEY STREET, 18TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02116</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <officerTitle></officerTitle>
            <otherText>Manager of GP of 10% owner.</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001018062</rptOwnerCik>
            <rptOwnerName>EVANS BRUCE R</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O SUMMIT PARTNERS, L.P.</rptOwnerStreet1>
            <rptOwnerStreet2>222 BERKLEY STREET, 18TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02116</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>
        <derivativeHolding>
            <securityTitle>
                <value>Series A Preferred Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2010-03-02</value>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>23992929</value>
                    <footnoteId id="F2"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Manager of GP of 10% owner.</value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The Series A preferred stock is convertible into Ubiquiti Networks, Inc. common stock on a one-for-one basis and has no expiration date.</footnote>
        <footnote id="F2">The shares underlying the Series A preferred stock are held as follows: 14,942,702 shares of common stock issuable upon the conversion of Series A preferred stock are held by Summit Partners Private Equity Fund VII-A, L.P., 8,974,825 shares of common stock issuable upon the conversion of Series A preferred stock are held by Summit Partners Private Equity Fund VII-B, L.P., 68,917 shares of common stock issuable upon the conversion of Series A preferred stock are held by Summit Investors I, LLC and 6,485 shares of common stock issuable upon the conversion of Series A preferred stock are held by Summit Investors I (UK), L.P.</footnote>
    </footnotes>

    <remarks>The entities mentioned in Footnote 2 are collectively referred to as the &quot;Summit Entities.&quot;  Summit Partners, L.P. is (i) the managing member of Summit Partners PE VII, LLC, which is the general partner of Summit Partners PE VII, L.P., which is the general partner of Summit Partners Private Equity Fund VII-A, L.P. and Summit Partners Private Equity Fund VII-B, L.P., and (ii) the managing member of Summit Investors Management, LLC, which is the manager of Summit Investors I, LLC., and the general partner of Summit Investors I (UK), L.P. Summit Partners, L.P., through a two-person investment committee, currently composed of Martin J. Mannion and Bruce R. Evans, has voting and dispositive authority over the shares held by each of these entities and therefore beneficially owns such shares.  Each of the Summit Entities and Messrs. Mannion  and Evans disclaim beneficial ownership of shares, and this report shall not be deemed an admission that the Reporting Persons are the beneficial owners of the shares for the purpose of Section 16 or for any other purpose, except, in each case, to the extent of each such Reporting Person's pecuniary interest therein.  Exhibits:  Exhibit 24 - Power of Attorney.</remarks>

    <ownerSignature>
        <signatureName>Summit Partners, L.P., /s/ Robin W. Devereux, as Attorney-in-Fact</signatureName>
        <signatureDate>2011-10-13</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Summit Partners PE VII, LLC, /s/ Robin W. Devereux, as Attorney-in-Fact</signatureName>
        <signatureDate>2011-10-13</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Summit Partners PE VII, L.P., /s/ Robin W. Devereux, as Attorney-in-Fact</signatureName>
        <signatureDate>2011-10-13</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Summit Investors Management, LLC, /s/ Robin W. Devereux, as Attorney-in-Fact</signatureName>
        <signatureDate>2011-10-13</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Robin W. Devereux, as Attorney-in-Fact for Martin J. Mannion</signatureName>
        <signatureDate>2011-10-13</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Robin W. Devereux, as Attorney-in-Fact for Bruce R. Evans</signatureName>
        <signatureDate>2011-10-13</signatureDate>
    </ownerSignature>
</ownershipDocument>
