-----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,
 TBxRhkdGd6ZqAOMLkEh2wlrb7SnkvYzyWOwgI3rLSwT0YBoFAGOMoxQHY5eA+p69
 o0u/kxMSV6stFf+CRCMb1g==

<SEC-DOCUMENT>0001181431-04-016871.txt : 20040322
<SEC-HEADER>0001181431-04-016871.hdr.sgml : 20040322
<ACCEPTANCE-DATETIME>20040322161826
ACCESSION NUMBER:		0001181431-04-016871
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 MATTHEW JOHN
		CENTRAL INDEX KEY:			0000933023

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-14764
		FILM NUMBER:		04682682

	BUSINESS ADDRESS:	
		STREET 1:		231 MAIN STREET
		STREET 2:		COURT HOUSE ANNEX
		CITY:			CHARDON
		STATE:			OH
		ZIP:			44024

	MAIL ADDRESS:	
		STREET 1:		17380 HASKINS ROAD
		CITY:			BAINBRIDGE
		STATE:			OH
		ZIP:			44023

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>rrd35948.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>0000933023</rptOwnerCik>
            <rptOwnerName>DOLAN MATTHEW JOHN</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>450</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <remarks>Reporting person is co-trustee of trusts in which he has no pecuniary interest.</remarks>

    <ownerSignature>
        <signatureName>William A. Frewin, Jr., Attorney-in-fact for Matthew J. Dolan</signatureName>
        <signatureDate>2004-03-19</signatureDate>
    </ownerSignature>
</ownershipDocument>

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