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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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 F+EsGrGUatx63JUTctgOyQ==

<SEC-DOCUMENT>0000891092-00-000146.txt : 20000307
<SEC-HEADER>0000891092-00-000146.hdr.sgml : 20000307
ACCESSION NUMBER:		0000891092-00-000146
CONFORMED SUBMISSION TYPE:	424B3
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20000301

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			OMNICOM GROUP INC
		CENTRAL INDEX KEY:			0000029989
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-ADVERTISING AGENCIES [7311]
		IRS NUMBER:				131514814
		STATE OF INCORPORATION:			NY
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		424B3
		SEC ACT:		
		SEC FILE NUMBER:	333-22589
		FILM NUMBER:		558449

	BUSINESS ADDRESS:	
		STREET 1:		437 MADISON AVE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10022
		BUSINESS PHONE:		2124153700

	MAIL ADDRESS:	
		STREET 1:		437 MADISON AVE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10022

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	DOYLE DANE BERNBACH GROUP INC
		DATE OF NAME CHANGE:	19861117

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	DOYLE DANE BERNBACH INTERNATIONAL INC
		DATE OF NAME CHANGE:	19850604

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	DOYLE DANE BERNBACH INC
		DATE OF NAME CHANGE:	19781226
</SEC-HEADER>
<DOCUMENT>
<TYPE>424B3
<SEQUENCE>1
<DESCRIPTION>FORM 424B3
<TEXT>


PROSPECTUS SUPPLEMENT
(To Prospectus Dated March 11, 1997)

                               OMNICOM GROUP INC.

                        $218,500,000 Principal Amount of
               4 1/4% Convertible Subordinated Debentures due 2007
                     (Interest Payable January 3 and July 3)

                       6,936,508 Shares of Common Stock

                             ----------------------

      This document  supplements the Prospectus dated March 11, 1997 relating to
(i) $218,500,000  aggregate  principal amount of 4 1/4% Convertible Subordinated
Debentures  due 2007  (the  "Debentures")  of  Omnicom  Group  Inc.,  a New York
corporation  ("Omnicom" or the "Company"),  and (ii) 6,936,508  shares of Common
Stock,  par value $0.50 per share (the "Common  Stock") of the Company which are
initially   issuable  upon   conversion  of  the  Debentures   plus   additional
indeterminate  number  of shares of Common  Stock as may  become  issuable  upon
conversion of the Debentures as a result of adjustments to the conversion  price
(the  "Shares").  The  Debentures  were  initially  acquired from the Company by
Morgan Stanley & Co.  Incorporated  in January 1997 in connection with a private
offering.  This  Prospectus  Supplement is  incorporated  by reference  into the
Prospectus, and all terms used herein shall have the meaning assigned to them in
the  Prospectus.  On February 25, 2000 the closing  price of the Common Stock as
reported on the New York Stock Exchange was $88.8125 per share. The Common Stock
is traded under the symbol "OMC."

      In  accordance  with  the  Section  of the  Prospectus  entitled  "Selling
Securityholders"  (which  appears  on  pages 19 and 20 of the  Prospectus),  the
following  information is provided with respect to the beneficial  owners of the
Debentures:

<TABLE>
<CAPTION>
                                                      Principal Amount          Principal Amount of
                                                        of Debentures            Debentures to be
Name of Selling Securityholder(s)                    Beneficially Owned          Offered for Sale
- --------------------------------                     -------------------       --------------------
<S>                                                       <C>                        <C>
State Retirement & Pension System of Maryland             $2,000,000                 $2,000,000
</TABLE>

      The  Debentures  being  offered  by  the  Selling  Securityholders  hereby
represent   all  of  the   Debentures   beneficially   owned   by  the   Selling
Securityholders  as of  February  25,  2000.  Except  for  the  purchase  of the
Debentures,  none of the Selling Securityholders has had a material relationship
with the Company or any of its affiliates within the past three years.

                             ----------------------

      THESE  SECURITIES  HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES
AND EXCHANGE  COMMISSION OR ANY STATE SECURITY COMMISSION NOR HAS THE SECURITIES
AND  EXCHANGE  COMMISSION  OR ANY STATE  SECURITIES  COMMISSION  PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.

                             ----------------------

            The date of this Prospectus Supplement is March 1, 2000.

</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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