-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 P10gAnGcUmz+hMYEWxSuvCUiXkBAqXToaFUYEqd6+Bk0aqRy1YvczTBGR8t53rj9
 9N+DxK21L/EWuscdFx6DbQ==

<SEC-DOCUMENT>0001181431-04-016875.txt : 20040322
<SEC-HEADER>0001181431-04-016875.hdr.sgml : 20040322
<ACCEPTANCE-DATETIME>20040322162150
ACCESSION NUMBER:		0001181431-04-016875
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20040319
FILED AS OF DATE:		20040322

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			DOLAN KATHLEEN MARGARET
		CENTRAL INDEX KEY:			0000933026

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-14764
		FILM NUMBER:		04682703

	BUSINESS ADDRESS:	
		STREET 1:		2 BARTLETT AVENUE
		CITY:			BELMONT
		STATE:			MA
		ZIP:			02178

	MAIL ADDRESS:	
		STREET 1:		2 BARTLETT AVENUE
		CITY:			BELMONT
		STATE:			MA
		ZIP:			02178

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CABLEVISION SYSTEMS CORP /NY
		CENTRAL INDEX KEY:			0001053112
		STANDARD INDUSTRIAL CLASSIFICATION:	CABLE & OTHER PAY TELEVISION SERVICES [4841]
		IRS NUMBER:				112776686
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		1111 STEWART AVENUE
		CITY:			BETHPAGE
		STATE:			NY
		ZIP:			11714
		BUSINESS PHONE:		5163806230

	MAIL ADDRESS:	
		STREET 1:		1111 STEWART AVENUE
		CITY:			BETHPAGE
		STATE:			NY
		ZIP:			11714
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>rrd35939.xml
<DESCRIPTION>FORM 3
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0201</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2004-03-19</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001053112</issuerCik>
        <issuerName>CABLEVISION SYSTEMS CORP /NY</issuerName>
        <issuerTradingSymbol>CVS</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000933026</rptOwnerCik>
            <rptOwnerName>DOLAN KATHLEEN MARGARET</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>340 CROSSWAYS PARK DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>WOODBURY</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>11797</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>Member of 13(d) Group</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>6381</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Class B Common Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>2021043</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Trusts</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Class B Common Stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F1"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F1"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>7977325</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Dolan Family LLC</value>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Class B Common Stock of Issuer is convertible at the option of the holder share for share into Class A Common Stock of the Issuer.</footnote>
        <footnote id="F2">Reporting person is co-trustee and contingent beneficiary of various family trusts.  Reporting person disclaims beneficial ownership of these securities except to the extent of her pecuniary interest and this report shall not be deemed to be an admission that such person is the beneficial owner of such securities.</footnote>
        <footnote id="F3">Reporting person is co-trustee and contingent beneficiary of various family trusts which are members of Dolan Family LLC.  Reporting person disclaims beneficial ownership of these securities except to the extent of her pecuniary interest and this report shall not be deemed to be an admission that such person is the beneficial owner of such securities.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>William A. Frewin, Jr., Attorney-in-Fact for Kathleen M. Dolan</signatureName>
        <signatureDate>2004-03-19</signatureDate>
    </ownerSignature>
</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----