UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 8-K

                                 CURRENT REPORT
     Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

               Date of Report (Date of earliest event reported):
                                  June 30, 2005

                               OMNICOM GROUP INC.
                               ------------------
             (Exact name of registrant as specified in its charter)

          New York                    No. 001-10551            No. 13-1514814
          --------                    -------------            --------------
(State or other jurisdiction           (Commission             (IRS Employer
     of incorporation)                 File Number)          Identification No.)

                437 Madison Avenue
                New York, New York                                  10022
                ------------------                                  -----
     (Address of principal executive offices)                     (Zip Code)

       Registrant's telephone number, including area code: (212) 415-3600

                                 Not Applicable
--------------------------------------------------------------------------------
          (Former name or former address, if changed since last report)

Check  the  appropriate  box  below  if the  Form  8-K  filing  is  intended  to
simultaneously  satisfy the filing obligation of the registrant under any of the
following provisions (see General Instruction A.2. below):

[_]   Written  communications  pursuant to Rule 425 under the Securities Act (17
      CFR 230.425)

[_]   Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
      240.14a-12)

[_]   Pre-commencement  communications  pursuant  to  Rule  14d-2(b)  under  the
      Exchange Act (17 CFR 240.14d-2(b))

[_]   Pre-commencement  communications  pursuant  to  Rule  13e-4(c)  under  the
      Exchange Act (17 CFR 240.13e-4(c))




Item 1.01 Entry into a Material Definitive Agreement.

      On June 30, 2005,  Omnicom Group Inc. (the "Company") and its wholly owned
subsidiaries  Omnicom Finance Inc., Omnicom Capital Inc. and Omnicom Finance Plc
(the "Borrowers"  and,  together with the Company,  the "Loan Parties")  entered
into a 364-Day Credit Agreement (the "Credit  Agreement") with the lenders named
therein  (the  "Lenders"),   Citigroup  Global  Markets  Inc.  and  J.P.  Morgan
Securities  Inc., as lead  arrangers and book  managers,  ABN Amro Bank N.V., as
syndication  agent,  JPMorgan Chase Bank, N.A., Bank of America,  N.A. and Banco
Bilbao  Vizcaya  Argentaria,  as  documentation  agents,  and Citibank,  N.A. as
administrative  agent (the "Agent") for the Lenders.  The Credit Agreement has a
maturity  date of June  29,  2006.  Under  the  Credit  Agreement,  the  Lenders
committed  to provide  advances in an  aggregate  amount of up to  $400,000,000.
Interest on the borrowings  under the Credit Agreement is payable at a base rate
or  Eurodollar  rate,  in  either  case  plus an  applicable  margin  and  fees.
Borrowings  under  the  Credit  Agreement  will be used  for  general  corporate
purposes of the Borrowers and their subsidiaries, including to fund acquisitions
not prohibited under the Credit Agreement.

      The terms of the Credit Agreement  include customary  representations  and
warranties,  affirmative and negative  covenants  (including  certain  financial
covenants)  and  events  of  default.  Upon  the  occurrence,   and  during  the
continuance,  of an event of default, including but not limited to nonpayment of
principal when due,  failure to perform or observe  certain terms,  covenants or
agreements   under  the  Credit   Agreement,   and  certain  defaults  of  other
indebtedness,  the Agent may terminate  the  obligation of the Lenders under the
Credit Agreement to make advances and declare any outstanding  obligations under
the Credit Agreement  immediately due and payable. In addition,  in the event of
an actual or deemed  entry of an order for relief with respect to any Loan Party
under  the  Federal  Bankruptcy  Code,  the  obligation  of each  Lender to make
advances shall automatically terminate and any outstanding obligations under the
Credit Agreement shall immediately become due and payable.

      The obligations of the Borrowers under the Credit Agreement are secured by
an absolute guaranty of the Company.

      The foregoing description of the Credit Agreement does not purport to be a
complete  statement  of the  parties'  rights and  obligations  under the Credit
Agreement  and  the  transactions  contemplated  by the  Credit  Agreement.  The
foregoing  description  of the Credit  Agreement is qualified in its entirety by
reference to the Credit Agreement, a copy of which is attached hereto as Exhibit
10.1 and is incorporated herein by reference.

Item 2.03 Creation of a Direct  Financial  Obligation or an Obligation  under an
Off-Balance Sheet Arrangement of a Registrant

      The  information  described  above  under "Item 1.01 Entry into a Material
Definitive Agreement" is hereby incorporated herein by reference.


                                       2


Item 9.01 Financial Statements and Exhibits.

      (c) Exhibits.

      The following exhibit is filed as part of this Current Report on Form 8-K:

      10.1  364-Day Credit Agreement (the "Credit Agreement"),  dated as of June
            30, 2005, by and among  Omnicom Group Inc., a New York  corporation,
            Omnicom Finance Inc., a Delaware corporation, Omnicom Capital Inc. a
            Connecticut   corporation,   Omnicom   Finance  Plc,  a  corporation
            organized under the laws of England and Wales,  the lenders named in
            the Credit Agreement (the "Lenders"),  Citigroup Global Markets Inc.
            and  J.P.  Morgan  Securities  Inc.,  as  lead  arrangers  and  book
            managers,  ABN Amro Bank N.V., as syndication agent,  JPMorgan Chase
            Bank,  N.A.,  Bank  of  America,   N.A.  and  Banco  Bilbao  Vizcaya
            Argentaria,   as  documentation   agents,  and  Citibank,   N.A.  as
            administrative agent for the Lenders.


                                       3


                                    SIGNATURE

      Pursuant to the  requirements of the Securities  Exchange Act of 1934, the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned hereunto duly authorized.

                                       OMNICOM GROUP INC.

Date: June 30, 2005                    By: /s/ Michael J. O'Brien
                                           -------------------------------------
                                           Name:  Michael J. O'Brien
                                           Title: Senior Vice President, General
                                                  Counsel and Secretary


                                       4


                                  EXHIBIT INDEX

Exhibit No.                          Exhibit
-----------                          -------

   10.1     364-Day Credit Agreement (the "Credit Agreement"),  dated as of June
            30, 2005, by and among  Omnicom Group Inc., a New York  corporation,
            Omnicom Finance Inc., a Delaware corporation, Omnicom Capital Inc. a
            Connecticut   corporation,   Omnicom   Finance  Plc,  a  corporation
            organized under the laws of England and Wales,  the lenders named in
            the Credit Agreement (the "Lenders"),  Citigroup Global Markets Inc.
            and  J.P.  Morgan  Securities  Inc.,  as  lead  arrangers  and  book
            managers,  ABN Amro Bank N.V., as syndication agent,  JPMorgan Chase
            Bank,  N.A.,  Bank  of  America,   N.A.  and  Banco  Bilbao  Vizcaya
            Argentaria,   as  documentation   agents,  and  Citibank,   N.A.  as
            administrative agent for the Lenders