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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2014-06-06</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001492633</issuerCik>
        <issuerName>Nielsen N.V.</issuerName>
        <issuerTradingSymbol>NLSN</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001510911</rptOwnerCik>
            <rptOwnerName>Thomas H. Lee Advisors (Alternative) VI, Ltd.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O INTERTRUST CORP. SVCES (CAYMAN) LTD.</rptOwnerStreet1>
            <rptOwnerStreet2>190 ELGIN AVENUE</rptOwnerStreet2>
            <rptOwnerCity>GEORGETOWN, GRAND CAYMAN</rptOwnerCity>
            <rptOwnerState>E9</rptOwnerState>
            <rptOwnerZipCode>KY1-9005</rptOwnerZipCode>
            <rptOwnerStateDescription>CAYMAN ISLANDS</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001250491</rptOwnerCik>
            <rptOwnerName>THOMAS H LEE ALTERNATIVE CAYMAN FUND V LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O INTERTRUST CORPORATE SERVICES (CAYMA</rptOwnerStreet1>
            <rptOwnerStreet2>190 ELGIN AVENUE</rptOwnerStreet2>
            <rptOwnerCity>GEORGETOWN</rptOwnerCity>
            <rptOwnerState>E9</rptOwnerState>
            <rptOwnerZipCode>KY1-9005</rptOwnerZipCode>
            <rptOwnerStateDescription>CAYMAN ISLANDS</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001055736</rptOwnerCik>
            <rptOwnerName>LEE THOMAS H INVESTORS LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O THOMAS H. LEE PARTNERS, L.P.</rptOwnerStreet1>
            <rptOwnerStreet2>100 FEDERAL STREET, 35TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02110</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001429869</rptOwnerCik>
            <rptOwnerName>THL Coinvestment Partners, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>100 FEDERAL STREET</rptOwnerStreet1>
            <rptOwnerStreet2>C/O THOMAS H. LEE PARTNERS, L.P.</rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02110</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001336329</rptOwnerCik>
            <rptOwnerName>Putnam Investment Holdings, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O THOMAS H. LEE PARTNERS, L.P.</rptOwnerStreet1>
            <rptOwnerStreet2>100 FEDERAL STREET, 35TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02110</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001336330</rptOwnerCik>
            <rptOwnerName>Putnam Investments Employees Securities CO I LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O THOMAS H. LEE PARTNERS, L.P.</rptOwnerStreet1>
            <rptOwnerStreet2>100 FEDERAL STREET, 35TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02110</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001336331</rptOwnerCik>
            <rptOwnerName>Putnam Investments Employees Securities CO II LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O THOMAS H. LEE PARTNERS, L.P.</rptOwnerStreet1>
            <rptOwnerStreet2>100 FEDERAL STREET, 35TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02110</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001545929</rptOwnerCik>
            <rptOwnerName>Putnam Investments Employees' Securities Co III LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O THOMAS H.LEE PARTNERS, L.P.</rptOwnerStreet1>
            <rptOwnerStreet2>100 FEDERAL STREET, 35TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02110</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2014-06-06</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>4027248</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>47.08</value>
                    <footnoteId id="F6"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>10332410</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F1"/>
                    <footnoteId id="F5"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2014-06-06</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>1264234</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>47.08</value>
                    <footnoteId id="F6"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3243547</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                    <footnoteId id="F5"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Represents shares of the Issuer held through Valcon Acquisition Holding (Luxembourg) S.a r.l., a private limited company incorporated under the laws of Luxembourg (&quot;Luxco&quot;) sold by the following entities:  1,575,685 shares sold by Thomas H. Lee (Alternative) Fund VI, L.P. (&quot;Alternative Fund VI&quot;); 1,066,969 shares sold by Thomas H. Lee (Alternative) Parallel Fund VI, L.P. (&quot;Alternative Parallel VI&quot;); 186,379 shares sold by Thomas H. Lee (Alternative) Parallel (DT) Fund VI, L.P. (&quot;Alternative DT VI&quot;); 1,092,200 shares sold by THL Equity Fund VI Investors (VNU), L.P.; 11,409 shares sold by THL Equity Fund VI Investors (VNU) II, L.P.; 16,774 shares sold by THL Equity Fund VI Investors (VNU) III, L.P.; 58,861 shares sold by THL Equity Fund VI Investors (VNU) IV, LLC; 2,891 shares sold by THL Coinvestment Partners, L.P.; 8,042 shares sold by Putnam Investments Holdings, LLC; and 8,038 shares sold by Putnam Investments Employees' Securities Company III LLC.</footnote>
        <footnote id="F2">(Continuation of Footnote 1) - The reporting person is the general partner of THL Advisors (Alternative) VI, L.P. (&quot;Advisors VI&quot;), which in turn is the general partner of each of Alternative Fund VI, Alternative Parallel VI, Alternative DT VI, THL Equity Fund VI Investors (VNU), L.P., THL Equity Fund VI Investors (VNU) II, L.P. and THL Equity Fund VI Investors (VNU) III, L.P. and the managing member of THL Equity Fund VI Investors (VNU) IV, LLC.  THL Coinvestment Partners, L.P., Putnam Investments Holdings, LLC and Putnam Investments Employees' Securities Company III LLC are each contractually obligated to coinvest (and dispose of securities) alongside Alternative Fund VI on a pro rata basis.</footnote>
        <footnote id="F3">Represents shares of the Issuer held through Valcon Acquisition Holding (Luxembourg) S.a r.l., a private limited company incorporated under the laws of Luxembourg (&quot;Luxco&quot;) sold by the following entities:  962,565 shares sold by Thomas H. Lee (Alternative) Fund V, L.P. (&quot;Alternative Fund V&quot;); 249,747 shares sold by Thomas H. Lee (Alternative) Parallel Fund V, L.P. (&quot;Alternative Parallel V&quot;); 13,263 shares sold by Thomas H. Lee (Alternative) Cayman Fund V, L.P. (&quot;Alternative Cayman V&quot;); 18,655 shares sold by Thomas H. Lee Investors Limited Partnership; 7,620 shares sold by Putnam Investment Holdings, LLC;6,543 shares sold by Putnam Investments Employees' Securities Company I LLC; and 5,841 shares sold by Putnam Investments Employees' Securities Company II LLC.</footnote>
        <footnote id="F4">(Continuation of Footnote 3) - Thomas H. Lee Advisors (Alternative) V Limited LDC (&quot;LDC&quot;) is the general partner of THL Advisors (Alternative) V, L.P. (&quot;Advisors V&quot;), which in turn is the general partner of each of Alternative Fund V, Alternative Parallel V, and Alternative Cayman V.  THL Coinvestment Partners, L.P, Thomas H. Lee Investors Limited Partnership, Putnam Investments Holdings, LLC, Putnam Investments Employees' Securities Company I LLC and Putnam Investments Employees' Securities Company II LLC are each contractually obligated to coinvest (and dispose of securities) alongside Alternative Fund V on a pro rata basis.   Therefore, the reporting person may be deemed to beneficially own the shares of the Issuer owned directly by each of these entities.</footnote>
        <footnote id="F5">The reporting person disclaims beneficial ownership of all such shares, and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for the purpose of Section 16 or for any other purpose, except to the extent of its pecuniary interest therein.</footnote>
        <footnote id="F6">This amount represents the $47.20 public offering price per share of the Issuer's common stock less the underwriting discount of $0.12 per share.</footnote>
    </footnotes>

    <remarks>Exhibit 99.1 (Joint Filer Information) incorporated herein by reference.

Due to the technical limitation of the number of reporting persons included in each Form 4 filling, this filling is being conducted in two parts. This is part 2 of 2.</remarks>

    <ownerSignature>
        <signatureName>/s/ Thomas H. Lee Advisors (Alternative) VI, Ltd. By: Charles P. Holden, Managing Director</signatureName>
        <signatureDate>2014-06-10</signatureDate>
    </ownerSignature>
</ownershipDocument>
