As filed with the Securities and Exchange Commission on March 19, 2002.
                                                    Registration No. 333-_______

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM S-8
                             REGISTRATION STATEMENT
                                      Under
                           The Securities Act of 1933

                               OMNICOM GROUP INC.
             (Exact Name of Registrant as Specified in Its Charter)

            NEW YORK                                     13-1514814
  (State or Other Jurisdiction              (I.R.S. Employer Identification No.)
of Incorporation or Organization)

                  437 Madison Avenue, New York, New York 10022
           (Address of Principal Executive Offices Including Zip Code)

               OMNICOM GROUP INC. LONG-TERM SHAREHOLDER VALUE PLAN
                            (Full Title of the Plan)

                              Barry J. Wagner, Esq.
                          Secretary and General Counsel
                               Omnicom Group Inc.
                               437 Madison Avenue
                               New York, NY 10022
                            Telephone: (212) 415-3600
            (Name, Address and Telephone Number of Agent For Service)

                                   Copies To:
                              Lyle G. Ganske, Esq.
                           Jones, Day, Reavis & Pogue
                                   North Point
                               901 Lakside Avenue
                           Cleveland, Ohio 44114-1190
                                 (216) 586-3939

                         CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
==================================================================================================================
Title of                                            Proposed Maxi-           Proposed Maxi-           Amount of
Securities to              Amount to be             mum Offering             mum Aggregate            Registration
be Registered              Registered (1)(2)        Price Per Share (3)      Offering Price (3)       Fee
------------------------------------------------------------------------------------------------------------------
<S>                        <C>                      <C>                      <C>                      <C>
Common Stock, $0.15 par    5,765,325                $92.875                  $535,454,559.38          $49,261.82
value per share
==================================================================================================================
</TABLE>

(1)   Represents  maximum  number of shares of common  stock of the  registrant,
      $0.15 par  value per share  ("Common  Stock"),  issuable  pursuant  to the
      Omnicom  Group Inc.  Long-Term  Shareholder  Value Plan (the "Plan") being
      registered hereon.
(2)   Pursuant to Rule  416(c) of the  Securities  Act of 1933 (the  "Securities
      Act"),  this  Registration  Statement also covers such  additional  Common
      Stock as may become issuable pursuant to the  anti-dilution  provisions of
      the stock option agreements entered into pursuant to the Plan.
(3)   Estimated  solely  for  calculating  the amount of the  registration  fee,
      pursuant to  paragraphs  (c) and (h) of Rule 457 of the General  Rules and
      Regulations  under the Securities  Act, on the basis of the average of the
      high and low sale prices of such securities on the New York Stock Exchange
      on March 15, 2002, within five business days prior to filing.

<PAGE>

                                     PART II
               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3. Incorporation of Documents by Reference.

      The following documents have been filed by the Company with the Securities
and Exchange Commission (the "Commission") and are incorporated herein by
reference:

      o The Company's Annual Report on Form 10-K for the year ended December 31,
      2000, including all material incorporated by reference therein;

      o The Company's Quarterly Report on Form 10-Q for the quarter ended March
      31, 2001, including all material incorporated by reference therein;

      o The Company's Quarterly Report on Form 10-Q for the quarter ended June
      30, 2001, including all material incorporated by reference therein;

      o The Company's Quarterly Report on Form 10-Q for the quarter ended
      September 30, 2001, including all material incorporated by reference
      therein; and

      o The description of the Company's common stock contained in the
      Registration Statement on Form S-3 filed with the Commission on February
      12, 2001, including any subsequently filed amendments and reports updating
      such description.

      All documents filed by the Company with the Commission pursuant to
Sections 13(a), 13(c), 14 and 15(d) of the Securities Exchange Act of 1934
subsequent to the date of this registration statement and prior to the filing of
a post-effective amendment that indicates that all securities offered have been
sold or which deregisters all securities then remaining unsold, will be deemed
to be incorporated by reference in this registration statement and to be part
hereof from the date of filing of such documents. Any statement contained in any
document incorporated or deemed to be incorporated by reference herein will be
deemed to be modified or superseded for purposes of this registration statement
to the extent that a statement contained herein or in any other subsequently
filed document which also is or is deemed to be incorporated by reference herein
modifies or supersedes such statement. Any such statement so modified or
superseded will not be deemed, except as modified or superseded, to constitute a
part of this registration statement.

Item 4. Description of Securities.

      Not applicable.

Item 5. Interests of Named Experts and Counsel.

      Not applicable.

<PAGE>

Item 6. Indemnification of Directors and Officers.

      The Company's certificate of incorporation contains a provision limiting
the liability of directors to acts or omissions determined by a judgment or
other final adjudication to have been in bad faith, involving intentional
misconduct or a knowing violation of the law, or resulting in personal gain to
which the director was not legally entitled. The Company's bylaws provide that
an officer or director will be indemnified against any costs or liabilities,
including attorney's fees and amounts paid in settlement with the Company's
consent, in connection with any claim, action or proceeding to the fullest
extent permitted by the New York Business Corporation Law.

      Section 722(a) of the New York Business Corporation Law provides that a
corporation may indemnify any officer or director made, or threatened to be
made, a party to an action other than one by or in the right of the corporation,
including an action by or in the right of any other corporation or other
enterprise that any director or officer of the corporation served in any
capacity at the request of the corporation, because he was a director or officer
of the corporation, or served such other corporation or other enterprise in any
capacity, against judgments, fines, amounts paid in settlement and reasonable
expenses, including attorneys' fees, actually and necessarily incurred as a
result of such action, or any appeal therein, if such director or officer acted
in good faith for a purpose he reasonably believed to be in, or in the case of
service for any other corporation or other enterprise, not opposed to, the best
interests of the corporation and, in criminal actions, had no reasonable cause
to believe that his conduct was unlawful.

      Section 722(c) of the New York Business Corporation Law provides that a
corporation may indemnify any officer or director made, or threatened to be
made, a party to an action by or in the right of the corporation by reason of
the fact that he is or was an officer or director of the corporation, or is or
was serving at the request of the corporation as a director or officer of any
other corporation or other enterprise, against amounts paid in settlement and
reasonable expenses, including attorneys' fees, actually and necessarily
incurred by him in connection with the defense or settlement of such action, or
in connection with an appeal therein, if such director or officer acted in good
faith for a purpose which he reasonably believed to be in, or, in the case of
service for another corporation or other enterprise, not opposed to, the best
interests of the corporation. The corporation may not, however, indemnify any
officer or director pursuant to Section 722(c) in respect of (1) a threatened
action or a pending action that is settled or otherwise disposed of or (2) any
claim, issue or matter for which the person has been adjudged to be liable to
the corporation, unless and only to the extent that the court in which the
action was brought or, if no action was brought, any court of competent
jurisdiction, determines upon application that the person is fairly and
reasonably entitled to indemnity for that portion of the settlement and expenses
as the court deems proper.

      Section 723 of the New York Business Corporation Law provides that an
officer or director who has been successful on the merits or otherwise in the
defense of a civil or criminal action of the character set forth in Section 722
is entitled to indemnification as permitted in such Section. Section 724 of the
New York Business Corporation Law permits a court to award the indemnification
required by Section 722.

      The Company has entered into agreements with its directors to indemnify
them for liabilities or costs arising out of any alleged or actual breach of
duty, neglect, errors or omissions while serving as a director. The Company also
maintains and pays premiums for directors' and officers' liability insurance
policies.

<PAGE>

Item 7. Exemption from Registration Claimed.

      Not applicable.

Item 8. Exhibits.

Exhibit Number          Description
--------------          -----------

4.1                     Certificate of Incorporation of the Registrant (filed as
                        Exhibit 4.1 to the Registrant's Registration Statement
                        No. 333-46303 on Form S-3, dated February 13, 1998, and
                        incorporated herein by reference).

4.2                     Certificate of Amendment of Certificate of Incorporation
                        (filed as Exhibit 3.1 to the Registrant's Quarterly
                        Report on Form 10-Q for the quarter ended June 30, 2000,
                        and incorporated herein by reference).

4.3                     Bylaws of the Registrant (incorporated by reference to
                        the Registrant's Annual Report on Form 10-K for the year
                        ended December 31, 1987).

4.4                     Omnicom Group Inc. Long-Term Shareholder Value Plan.

5                       Opinion of Barry J. Wagner, General Counsel for the
                        Registrant.

23.1                    Consent of Arthur Andersen LLP.

23.2                    Consent of counsel --- see Exhibit 5.

24                      Power of Attorney.

Item 9. Undertakings.

      (a) The undersigned registrant hereby undertakes:

            (1) To file, during any period in which offers or sales are being
made, a post-effective amendment to this registration statement:

                  (i) to include any prospectus required by Section 10(a)(3) of
      the Securities Act of 1933;

                  (ii) to reflect in the prospectus any facts or events arising
      after the effective date of the registration statement (or the most recent
      post-effective amendment thereof) which, individually or in the aggregate,
      represent a fundamental change in the information set forth in the
      registration statement. Notwithstanding the foregoing, any increase or
      decrease in the volume of securities offered (if the total dollar value of
      securities offered would not exceed that which was registered) and any
      deviation from the low or high end of the estimated maximum offering range
      may be reflected in the form of prospectus filed with the Commission
      pursuant to Rule 424(b) if, in the aggregate, the changes in volume and
      price represent no more than a 20 percent change in the maximum aggregate
      price set forth in the "Calculation of Registration Fee" table in the
      effective registration statement; and

<PAGE>

                  (iii) to include any material information with respect to the
      plan of distribution not previously disclosed in the registration
      statement or any material change to such information in the registration
      statement.

            provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not
apply if the information required to be included in a post-effective amendment
by those paragraphs is contained in periodic reports filed by the registrant
pursuant to Section 13 or Section 15(d) of the Securities Exchange Act of 1934
that are incorporated by reference in this registration statement.

            (2) That, for the purpose of determining any liability under the
Securities Act of 1933, each such post-effective amendment will be deemed to be
a new registration statement relating to the securities offered therein, and the
offering of such securities at that time will be deemed to be the initial bona
fide offering thereof.

            (3) To remove from registration by means of a post-effective
amendment any of the securities being registered which remain unsold at the
termination of the offering.

      (b) The undersigned registration hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1933, each filing of the
registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Securities Exchange Act of 1934 (and, where applicable, each filing of an
employee benefit plan's annual report pursuant to Section 15(d) of the
Securities Exchange Act of 1934) that is incorporated by reference in this
Registration Statement will be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such securities
at that time will be deemed to be the initial bona fide offering thereof.

      (c) Insofar as indemnification for liabilities arising under the
Securities Act of 1933 may be permitted to directors, officers and controlling
persons of the registrant pursuant to the foregoing provisions, or otherwise,
the registrant has been advised that in the opinion of the Securities and
Exchange Commission such indemnification is against public policy as expressed
in the Act and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by the
registrant of expenses incurred or paid by a director, officer or controlling
person of the registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Act and will
be governed by the final adjudication of such issue.

                         [Signatures on following page]

<PAGE>

                                   SIGNATURES

      Pursuant to the requirements of the Securities Act of 1933, the Company
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-8 and has duly caused this registration
statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the city of New York, State of New York, on March 6, 2002.


                                        OMNICOM GROUP INC.

                                        By: /s/ John Wren
                                            ------------------------------------
                                            John D. Wren
                                            President, Chief Executive Officer
                                            and Director

Date: March 6, 2002                     By: /s/ John Wren
                                            ------------------------------------
                                        John D. Wren
                                        President, Chief Executive Officer and
                                        Director

Date: March 6, 2002                     By:                  *
                                            ------------------------------------
                                        Randall J. Weisenburger
                                        Chief Financial Officer

Date: March 6, 2002                     By:                  *
                                            ------------------------------------
                                        Philip J. Angelastro
                                        Controller

Date: March 6, 2002                     By:                  *
                                            ------------------------------------
                                        Thomas L. Harrison
                                        Director

Date: March 6, 2002                     By:                  *
                                            ------------------------------------
                                        Robert J. Callander
                                        Director

Date: March 6, 2002                     By:                  *
                                            ------------------------------------
                                        James A. Cannon
                                        Director

Date: March 6, 2002                     By:                  *
                                            ------------------------------------
                                        Leonard S. Coleman, Jr.
                                        Director

Date: March 6, 2002                     By:                  *
                                            ------------------------------------
                                        Bruce Crawford
                                        Director

Date: March 6, 2002                     By:                  *
                                            ------------------------------------
                                        Susan S. Denison
                                        Director

<PAGE>

Date: March 6, 2002                     By:                  *
                                            ------------------------------------
                                        Jean-Marie Dru
                                        Director

Date: March 6, 2002                     By:                  *
                                            ------------------------------------
                                        Michael Greenlees
                                        Director

Date: March 6, 2002                     By:                  *
                                            ------------------------------------
                                        John R. Murphy
                                        Director

Date: March 6, 2002                     By:                  *
                                            ------------------------------------
                                        John R. Purcell
                                        Director

Date: March 6, 2002                     By:                  *
                                            ------------------------------------
                                        Keith L. Reinhard
                                        Director

Date: March 6, 2002                     By:                  *
                                            ------------------------------------
                                        Linda Johnson Rice
                                        Director

Date: March 6, 2002                     By:                  *
                                            ------------------------------------
                                        Allen Rosenshine
                                        Director

Date: March 6, 2002                     By:                  *
                                            ------------------------------------
                                        Gary L. Roubos
                                        Director

*This registration statement has been signed on behalf of the above officers and
directors by Barry J. Wagner, as attorney-in-fact pursuant to a power of
attorney filed as Exhibit 24 to this Registration Statement.

DATED: March 6, 2002                    By: /s/ Barry J. Wagner
                                            ------------------------------------
                                                      Barry J. Wagner
                                                      Attorney-in-Fact

<PAGE>

                                  EXHIBIT INDEX

Exhibit Number          Description
--------------          -----------

4.1                     Certificate of Incorporation of the Registrant (filed as
                        Exhibit 4.1 to the Registrant's Registration Statement
                        No. 333-46303 on Form S-3, dated February 13, 1998, and
                        incorporated herein by reference).

4.2                     Certificate of Amendment of Certificate of Incorporation
                        (filed as Exhibit 3.1 to the Registrant's Quarterly
                        Report on Form 10-Q for the quarter ended June 30, 2000,
                        and incorporated herein by reference).

4.3                     Bylaws of the Registrant (incorporated by reference to
                        the Registrant's Annual Report on Form 10-K for the year
                        ended December 31, 1987).

4.4                     Omnicom Group Inc. Long-Term Shareholder Value Plan.

5                       Opinion of Barry J. Wagner, General Counsel of the
                        Registrant.

23.1                    Consent of Arthur Andersen LLP.

23.2                    Consent of counsel --- see Exhibit 5.

24                      Power of Attorney.
[{"type": "S-8", "sequence": "1", "filename": "e13174s8.txt", "description": "FORM S-8", "secsgml_size_bytes": 22852}]
{"company-data": {"conformed-name": "OMNICOM GROUP INC", "cik": "0000029989", "assigned-sic": "7311", "irs-number": "131514814", "state-of-incorporation": "NY", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "S-8", "act": "33", "file-number": "333-84498", "film-number": "02578232"}, "business-address": {"street1": "437 MADISON AVE", "city": "NEW YORK", "state": "NY", "zip": "10022", "phone": "2124153700"}, "mail-address": {"street1": "437 MADISON AVE", "city": "NEW YORK", "state": "NY", "zip": "10022"}, "former-company": [{"former-conformed-name": "DOYLE DANE BERNBACH INC", "date-changed": "19781226"}, {"former-conformed-name": "DOYLE DANE BERNBACH GROUP INC", "date-changed": "19861117"}, {"former-conformed-name": "DOYLE DANE BERNBACH INTERNATIONAL INC", "date-changed": "19850604"}]}
As filed with the Securities and Exchange Commission on March 19, 2002.
                                                    Registration No. 333-_______

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM S-8
                             REGISTRATION STATEMENT
                                      Under
                           The Securities Act of 1933

                               OMNICOM GROUP INC.
             (Exact Name of Registrant as Specified in Its Charter)

            NEW YORK                                     13-1514814
  (State or Other Jurisdiction              (I.R.S. Employer Identification No.)
of Incorporation or Organization)

                  437 Madison Avenue, New York, New York 10022
           (Address of Principal Executive Offices Including Zip Code)

               OMNICOM GROUP INC. LONG-TERM SHAREHOLDER VALUE PLAN
                            (Full Title of the Plan)

                              Barry J. Wagner, Esq.
                          Secretary and General Counsel
                               Omnicom Group Inc.
                               437 Madison Avenue
                               New York, NY 10022
                            Telephone: (212) 415-3600
            (Name, Address and Telephone Number of Agent For Service)

                                   Copies To:
                              Lyle G. Ganske, Esq.
                           Jones, Day, Reavis & Pogue
                                   North Point
                               901 Lakside Avenue
                           Cleveland, Ohio 44114-1190
                                 (216) 586-3939

                         CALCULATION OF REGISTRATION FEE
==================================================================================================================
Title of                                            Proposed Maxi-           Proposed Maxi-           Amount of
Securities to              Amount to be             mum Offering             mum Aggregate            Registration
be Registered              Registered (1)(2)        Price Per Share (3)      Offering Price (3)       Fee
------------------------------------------------------------------------------------------------------------------
Common Stock, $0.15 par    5,765,325                $92.875                  $535,454,559.38          $49,261.82
value per share
==================================================================================================================
(1)   Represents  maximum  number of shares of common  stock of the  registrant,
      $0.15 par  value per share  ("Common  Stock"),  issuable  pursuant  to the
      Omnicom  Group Inc.  Long-Term  Shareholder  Value Plan (the "Plan") being
      registered hereon.
(2)   Pursuant to Rule  416(c) of the  Securities  Act of 1933 (the  "Securities
      Act"),  this  Registration  Statement also covers such  additional  Common
      Stock as may become issuable pursuant to the  anti-dilution  provisions of
      the stock option agreements entered into pursuant to the Plan.
(3)   Estimated  solely  for  calculating  the amount of the  registration  fee,
      pursuant to  paragraphs  (c) and (h) of Rule 457 of the General  Rules and
      Regulations  under the Securities  Act, on the basis of the average of the
      high and low sale prices of such securities on the New York Stock Exchange
      on March 15, 2002, within five business days prior to filing.
PART II
               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3. Incorporation of Documents by Reference.

      The following documents have been filed by the Company with the Securities
and Exchange Commission (the "Commission") and are incorporated herein by
reference:

      o The Company's Annual Report on Form 10-K for the year ended December 31,
      2000, including all material incorporated by reference therein;

      o The Company's Quarterly Report on Form 10-Q for the quarter ended March
      31, 2001, including all material incorporated by reference therein;

      o The Company's Quarterly Report on Form 10-Q for the quarter ended June
      30, 2001, including all material incorporated by reference therein;

      o The Company's Quarterly Report on Form 10-Q for the quarter ended
      September 30, 2001, including all material incorporated by reference
      therein; and

      o The description of the Company's common stock contained in the
      Registration Statement on Form S-3 filed with the Commission on February
      12, 2001, including any subsequently filed amendments and reports updating
      such description.

      All documents filed by the Company with the Commission pursuant to
Sections 13(a), 13(c), 14 and 15(d) of the Securities Exchange Act of 1934
subsequent to the date of this registration statement and prior to the filing of
a post-effective amendment that indicates that all securities offered have been
sold or which deregisters all securities then remaining unsold, will be deemed
to be incorporated by reference in this registration statement and to be part
hereof from the date of filing of such documents. Any statement contained in any
document incorporated or deemed to be incorporated by reference herein will be
deemed to be modified or superseded for purposes of this registration statement
to the extent that a statement contained herein or in any other subsequently
filed document which also is or is deemed to be incorporated by reference herein
modifies or supersedes such statement. Any such statement so modified or
superseded will not be deemed, except as modified or superseded, to constitute a
part of this registration statement.

Item 4. Description of Securities.

      Not applicable.

Item 5. Interests of Named Experts and Counsel.

      Not applicable.
Item 6. Indemnification of Directors and Officers.

      The Company's certificate of incorporation contains a provision limiting
the liability of directors to acts or omissions determined by a judgment or
other final adjudication to have been in bad faith, involving intentional
misconduct or a knowing violation of the law, or resulting in personal gain to
which the director was not legally entitled. The Company's bylaws provide that
an officer or director will be indemnified against any costs or liabilities,
including attorney's fees and amounts paid in settlement with the Company's
consent, in connection with any claim, action or proceeding to the fullest
extent permitted by the New York Business Corporation Law.

      Section 722(a) of the New York Business Corporation Law provides that a
corporation may indemnify any officer or director made, or threatened to be
made, a party to an action other than one by or in the right of the corporation,
including an action by or in the right of any other corporation or other
enterprise that any director or officer of the corporation served in any
capacity at the request of the corporation, because he was a director or officer
of the corporation, or served such other corporation or other enterprise in any
capacity, against judgments, fines, amounts paid in settlement and reasonable
expenses, including attorneys' fees, actually and necessarily incurred as a
result of such action, or any appeal therein, if such director or officer acted
in good faith for a purpose he reasonably believed to be in, or in the case of
service for any other corporation or other enterprise, not opposed to, the best
interests of the corporation and, in criminal actions, had no reasonable cause
to believe that his conduct was unlawful.

      Section 722(c) of the New York Business Corporation Law provides that a
corporation may indemnify any officer or director made, or threatened to be
made, a party to an action by or in the right of the corporation by reason of
the fact that he is or was an officer or director of the corporation, or is or
was serving at the request of the corporation as a director or officer of any
other corporation or other enterprise, against amounts paid in settlement and
reasonable expenses, including attorneys' fees, actually and necessarily
incurred by him in connection with the defense or settlement of such action, or
in connection with an appeal therein, if such director or officer acted in good
faith for a purpose which he reasonably believed to be in, or, in the case of
service for another corporation or other enterprise, not opposed to, the best
interests of the corporation. The corporation may not, however, indemnify any
officer or director pursuant to Section 722(c) in respect of (1) a threatened
action or a pending action that is settled or otherwise disposed of or (2) any
claim, issue or matter for which the person has been adjudged to be liable to
the corporation, unless and only to the extent that the court in which the
action was brought or, if no action was brought, any court of competent
jurisdiction, determines upon application that the person is fairly and
reasonably entitled to indemnity for that portion of the settlement and expenses
as the court deems proper.

      Section 723 of the New York Business Corporation Law provides that an
officer or director who has been successful on the merits or otherwise in the
defense of a civil or criminal action of the character set forth in Section 722
is entitled to indemnification as permitted in such Section. Section 724 of the
New York Business Corporation Law permits a court to award the indemnification
required by Section 722.

      The Company has entered into agreements with its directors to indemnify
them for liabilities or costs arising out of any alleged or actual breach of
duty, neglect, errors or omissions while serving as a director. The Company also
maintains and pays premiums for directors' and officers' liability insurance
policies.
Item 7. Exemption from Registration Claimed.

      Not applicable.

Item 8. Exhibits.

Exhibit Number          Description
--------------          -----------

4.1                     Certificate of Incorporation of the Registrant (filed as
                        Exhibit 4.1 to the Registrant's Registration Statement
                        No. 333-46303 on Form S-3, dated February 13, 1998, and
                        incorporated herein by reference).

4.2                     Certificate of Amendment of Certificate of Incorporation
                        (filed as Exhibit 3.1 to the Registrant's Quarterly
                        Report on Form 10-Q for the quarter ended June 30, 2000,
                        and incorporated herein by reference).

4.3                     Bylaws of the Registrant (incorporated by reference to
                        the Registrant's Annual Report on Form 10-K for the year
                        ended December 31, 1987).

4.4                     Omnicom Group Inc. Long-Term Shareholder Value Plan.

5                       Opinion of Barry J. Wagner, General Counsel for the
                        Registrant.

23.1                    Consent of Arthur Andersen LLP.

23.2                    Consent of counsel --- see Exhibit 5.

24                      Power of Attorney.

Item 9. Undertakings.

      (a) The undersigned registrant hereby undertakes:

            (1) To file, during any period in which offers or sales are being
made, a post-effective amendment to this registration statement:

                  (i) to include any prospectus required by Section 10(a)(3) of
      the Securities Act of 1933;

                  (ii) to reflect in the prospectus any facts or events arising
      after the effective date of the registration statement (or the most recent
      post-effective amendment thereof) which, individually or in the aggregate,
      represent a fundamental change in the information set forth in the
      registration statement. Notwithstanding the foregoing, any increase or
      decrease in the volume of securities offered (if the total dollar value of
      securities offered would not exceed that which was registered) and any
      deviation from the low or high end of the estimated maximum offering range
      may be reflected in the form of prospectus filed with the Commission
      pursuant to Rule 424(b) if, in the aggregate, the changes in volume and
      price represent no more than a 20 percent change in the maximum aggregate
      price set forth in the "Calculation of Registration Fee" table in the
      effective registration statement; and
(iii) to include any material information with respect to the
      plan of distribution not previously disclosed in the registration
      statement or any material change to such information in the registration
      statement.

            provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not
apply if the information required to be included in a post-effective amendment
by those paragraphs is contained in periodic reports filed by the registrant
pursuant to Section 13 or Section 15(d) of the Securities Exchange Act of 1934
that are incorporated by reference in this registration statement.

            (2) That, for the purpose of determining any liability under the
Securities Act of 1933, each such post-effective amendment will be deemed to be
a new registration statement relating to the securities offered therein, and the
offering of such securities at that time will be deemed to be the initial bona
fide offering thereof.

            (3) To remove from registration by means of a post-effective
amendment any of the securities being registered which remain unsold at the
termination of the offering.

      (b) The undersigned registration hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1933, each filing of the
registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Securities Exchange Act of 1934 (and, where applicable, each filing of an
employee benefit plan's annual report pursuant to Section 15(d) of the
Securities Exchange Act of 1934) that is incorporated by reference in this
Registration Statement will be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such securities
at that time will be deemed to be the initial bona fide offering thereof.

      (c) Insofar as indemnification for liabilities arising under the
Securities Act of 1933 may be permitted to directors, officers and controlling
persons of the registrant pursuant to the foregoing provisions, or otherwise,
the registrant has been advised that in the opinion of the Securities and
Exchange Commission such indemnification is against public policy as expressed
in the Act and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by the
registrant of expenses incurred or paid by a director, officer or controlling
person of the registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Act and will
be governed by the final adjudication of such issue.

                         [Signatures on following page]
SIGNATURES

      Pursuant to the requirements of the Securities Act of 1933, the Company
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-8 and has duly caused this registration
statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the city of New York, State of New York, on March 6, 2002.

                                        OMNICOM GROUP INC.

                                        By: /s/ John Wren
                                            ------------------------------------
                                            John D. Wren
                                            President, Chief Executive Officer
                                            and Director

Date: March 6, 2002                     By: /s/ John Wren
                                            ------------------------------------
                                        John D. Wren
                                        President, Chief Executive Officer and
                                        Director

Date: March 6, 2002                     By:                  *
                                            ------------------------------------
                                        Randall J. Weisenburger
                                        Chief Financial Officer

Date: March 6, 2002                     By:                  *
                                            ------------------------------------
                                        Philip J. Angelastro
                                        Controller

Date: March 6, 2002                     By:                  *
                                            ------------------------------------
                                        Thomas L. Harrison
                                        Director

Date: March 6, 2002                     By:                  *
                                            ------------------------------------
                                        Robert J. Callander
                                        Director

Date: March 6, 2002                     By:                  *
                                            ------------------------------------
                                        James A. Cannon
                                        Director

Date: March 6, 2002                     By:                  *
                                            ------------------------------------
                                        Leonard S. Coleman, Jr.
                                        Director

Date: March 6, 2002                     By:                  *
                                            ------------------------------------
                                        Bruce Crawford
                                        Director

Date: March 6, 2002                     By:                  *
                                            ------------------------------------
                                        Susan S. Denison
                                        Director
Date: March 6, 2002                     By:                  *
                                            ------------------------------------
                                        Jean-Marie Dru
                                        Director

Date: March 6, 2002                     By:                  *
                                            ------------------------------------
                                        Michael Greenlees
                                        Director

Date: March 6, 2002                     By:                  *
                                            ------------------------------------
                                        John R. Murphy
                                        Director

Date: March 6, 2002                     By:                  *
                                            ------------------------------------
                                        John R. Purcell
                                        Director

Date: March 6, 2002                     By:                  *
                                            ------------------------------------
                                        Keith L. Reinhard
                                        Director

Date: March 6, 2002                     By:                  *
                                            ------------------------------------
                                        Linda Johnson Rice
                                        Director

Date: March 6, 2002                     By:                  *
                                            ------------------------------------
                                        Allen Rosenshine
                                        Director

Date: March 6, 2002                     By:                  *
                                            ------------------------------------
                                        Gary L. Roubos
                                        Director

*This registration statement has been signed on behalf of the above officers and
directors by Barry J. Wagner, as attorney-in-fact pursuant to a power of
attorney filed as Exhibit 24 to this Registration Statement.

DATED: March 6, 2002                    By: /s/ Barry J. Wagner
                                            ------------------------------------
                                                      Barry J. Wagner
                                                      Attorney-in-Fact
EXHIBIT INDEX

Exhibit Number          Description
--------------          -----------

4.1                     Certificate of Incorporation of the Registrant (filed as
                        Exhibit 4.1 to the Registrant's Registration Statement
                        No. 333-46303 on Form S-3, dated February 13, 1998, and
                        incorporated herein by reference).

4.2                     Certificate of Amendment of Certificate of Incorporation
                        (filed as Exhibit 3.1 to the Registrant's Quarterly
                        Report on Form 10-Q for the quarter ended June 30, 2000,
                        and incorporated herein by reference).

4.3                     Bylaws of the Registrant (incorporated by reference to
                        the Registrant's Annual Report on Form 10-K for the year
                        ended December 31, 1987).

4.4                     Omnicom Group Inc. Long-Term Shareholder Value Plan.

5                       Opinion of Barry J. Wagner, General Counsel of the
                        Registrant.

23.1                    Consent of Arthur Andersen LLP.

23.2                    Consent of counsel --- see Exhibit 5.

24                      Power of Attorney.