CONFORMED COPY

                               OMNICOM GROUP INC.

                                FRF 1,000,000,000
                          5.20 per cent. Notes due 2005

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

                                DEED OF COVENANT

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

                                  24 June 1998

                                 Clifford Chance
                                     London



ANY UNITED STATES PERSON  ENTITLED TO THE BENEFITS OF THIS DEED OF COVENANT WILL
BE SUBJECT TO LIMITATIONS UNDER THE UNITED STATES INCOME TAX LAWS, INCLUDING THE
LIMITATIONS  PROVIDED IN SECTIONS  165(j) AND  1287(a) OF THE  INTERNAL  REVENUE
CODE.

THIS DEED OF COVENANT is made on 24 June 1998

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BY

(1) OMNICOM GROUP INC. (the "Issuer")

IN FAVOUR OF

(2) THE ACCOUNTHOLDERS (as defined below).

WHEREAS

(A) The Issuer has  authorised  the  creation and issue of  FRF1,000,000,000  in
aggregate principal amount of 5.20 per cent. Notes due 2005 (the "Notes").

(B) The Notes will be in bearer form and in the  denominations  of FRF10,000 and
FRF100,000. The Notes will initially be issued in the form of a temporary global
Note (the "Temporary  Global Note") which will be  exchangeable  for a permanent
global Note (the "Permanent Global Note") in the circumstances  specified in the
Temporary  Global Note. The Permanent  Global Note will in turn be  exchangeable
for  Notes in  definitive  form  ("Definitive  Notes"),  with  interest  coupons
attached, in the circumstances specified in the Permanent Global Note.

(C) The  Permanent  Global Note will be  delivered  to a common  depositary  for
Morgan Guaranty Trust Company of New York,  Brussels office,  as operator of the
Euroclear System  ("Euroclear"),  Cedel Bank, societe anonyme ("Cedel Bank") and
SICOVAM S.A. ("SICOVAM").

(D) The  Issuer  will,  in  relation  to the Notes,  enter into a fiscal  agency
agreement  (as amended or  supplemented  from time to time,  the "Fiscal  Agency
Agreement")  with Societe  Generale Bank & Trust S.A.,  Luxembourg  (the "Fiscal
Agent", which expression includes any successor fiscal agent appointed from time
to time in connection with the Notes) and the other paying agents named therein.

(E) The Issuer wishes to make  arrangements  for the protection of the interests
of  Accountholders  in the event that the Permanent  Global Note becomes void in
accordance with its terms.

THIS DEED OF COVENANT WITNESSES as follows:

1. Interpretation

1.01  Definitions:  In this Deed of Covenant the following  expressions have the
following meanings:


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      "Accountholder"  means any  accountholder  with a Clearing System which at
      the  Determination  Date has credited to its securities  account with such
      Clearing  System one or more  Entries in respect of the  Permanent  Global
      Note,   except  for  either   Clearing   System  in  its  capacity  as  an
      accountholder of the other Clearing System;

      "Clearing System" means each of Euroclear, Cedel Bank and SICOVAM;

      "Conditions"  means the terms and conditions of the Notes (as scheduled to
      the  Fiscal  Agency  Agreement  and as  modified  from  time  to  time  in
      accordance with their terms), and any reference to a numbered  "Condition"
      is to the correspondingly numbered provision thereof;

      "Determination  Date"  means the date on which the  Permanent  Global Note
      becomes void in accordance with its terms;

      "Direct Rights" means the rights referred to in Clause 2.01;

      "Entry"  means any entry  which is made in the  securities  account of any
      Accountholder  with a Clearing  System in respect of Notes  represented by
      the Permanent Global Note; and

      "Principal Amount" means, in respect of any Entry, the aggregate principal
      amount of the Notes to which such Entry relates.

1.02 Other defined terms: Terms defined in the Conditions have the same meanings
in this Deed of Covenant.

1.03  Clauses:  Any  reference  in this Deed of Covenant to a Clause is,  unless
otherwise stated, to a clause hereof.

1.04  Headings:  Headings and  sub-headings  are for ease of reference  only and
shall not affect the construction of this Deed of Covenant.

2. Direct Rights

2.01 Creation:  If the Permanent Global Note becomes void in accordance with its
terms,  each  Accountholder  shall have  against the Issuer all rights  ("Direct
Rights")  which  such  Accountholder  would have had in respect of the Notes if,
immediately before the Determination  Date, it had been the holder of Definitive
Notes, duly executed, authenticated and issued, in an aggregate principal amount
equal to the Principal Amount of such Accountholder's Entries including (without
limitation) the right to receive all payments due at any time in respect of such
Definitive  Notes  as if  such  Definitive  Notes  or (as the  case  may be) the
relevant Coupon(s) had been duly presented and (in the case of a Coupon or final
redemption of a Definitive Note)  surrendered on the due date in accordance with
the Conditions.

2.02 No further  action:  No further action shall be required on the part of the
Issuer or any other person for the  Accountholders  to enjoy the Direct  Rights;
provided,  however,  that nothing  herein  shall  entitle any  Accountholder  to
receive  any payment in respect of the  Permanent  Global Note which has already
been made.


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3. Evidence

3.01 Records:  The records of the Clearing Systems shall be conclusive as to the
identity of the  Accountholders  and the  respective  amounts  credited to their
securities accounts and a statement issued by a Clearing System setting out:

      (a)   the name of the Accountholder in respect of which it is issued; and

      (b)   the Principal Amount of any Entry credited to the securities account
            of such Accountholder with such Clearing System on any date,

shall be conclusive evidence for all purposes of this Deed of Covenant.

3.02 Determination Date: If a Clearing System determines the Determination Date,
such  determination  shall be binding on all  Accountholders  with such Clearing
System and any other relevant clearing system.

4. Deposit of Deed of Covenant

This Deed of Covenant shall be deposited with and held by the Fiscal Agent until
the date on which all the  obligations  of the Issuer under or in respect of the
Notes  (including,  without  limitation,  its  obligations  under  this  Deed of
Covenant) have been discharged in full. The Issuer hereby acknowledges the right
of every Accountholder to the production of this Deed of Covenant.

5. Taxation

All  payments  under this Deed of Covenant  shall be made free and clear of, and
without  withholding  or  deduction  for,  any  taxes,  duties,  assessments  or
governmental charges of whatsoever nature imposed, levied,  collected,  withheld
or assessed by the United States of America or any political  subdivision or any
authority  thereof or therein  having power to tax,  unless such  withholding or
deduction  is  required  by law.  In that  event,  the  Issuer  shall  pay  such
additional  amounts as will result in the receipt by the  Accountholders of such
amounts as would have been received by them if no such  withholding or deduction
had been required,  except that no such  additional  amounts shall be payable in
respect of:

      (a)   any tax, duty,  assessment or other governmental  charge which would
            not have been imposed but for the existence of any present or former
            connection  between  such  Accountholder  (or  between a  fiduciary,
            settlor  or  beneficiary  of,  or  possessor  of a power  over  such
            Accountholder,  if such  Accountholder  is an estate or trust;  or a
            member or shareholder of such  Accountholder,  if such Accountholder
            is a trust, a partnership  or a corporation)  and the United States;
            the  Commonwealth  of Puerto Rico or any  territory or possession of
            the United  States or area  subject to its  jurisdiction  including,
            without limitation, such Accountholder (or such fiduciary,  settlor,
            beneficiary,  possessor, member or shareholder) being or having been
            a U.S. Person (as defined below);

      (b)   any estate, inheritance, gift, sales, transfer, personal property or
            any similar tax, duty, assessment or other governmental charge;


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      (c)   any tax, duty,  assessment or other  governmental  charge imposed by
            reason  of such  Accountholder's  past or  present  status  (i) as a
            personal  holding company or foreign  personal  holding company with
            respect  to  the  United  States,   (ii)  as  a  corporation   which
            accumulates  earnings to avoid  United  States  federal  income tax,
            (iii) as a controlled foreign corporation with respect to the United
            States,  (iv) as the owner,  actually or constructively,  of ten per
            cent., or more, of the total combined voting power of all classes of
            stock of the Issuer entitled to vote, (v) as a private foundation or
            other  exempt  organisation  or  (vi) as a bank  receiving  interest
            described  in  Section  881(c) 3 (A) of the United  States  Internal
            Revenue Code of 1986, as amended;

      (d)   any tax, duty,  assessment or other  governmental  charge that would
            not  have  been  imposed  but  for a  failure  to  comply  with  any
            applicable  certification,   information,   documentation  or  other
            reporting  requirements   concerning  the  nationality,   residence,
            identity or connection with the United States of the  Accountholder,
            if without regard to any tax treaty,  such compliance is required by
            statute or  regulation  of the United  States as a  precondition  to
            relief  or  exemption  from  such  tax,  duty,  assessment  or other
            governmental charge;

      (e)   any tax,  duty,  assessment or  governmental  charge that is payable
            otherwise  than by withholding by the Issuer from the payment of the
            principal or, as the case may be, redemption amount in respect of or
            interest payable hereunder;

      (f)   any combination of items (a), (b), (c), (d) or (e) above;

nor shall  additional  amounts be paid (i) to any  Accountholder  who is not the
beneficial  owner of the right to payment  of  principal,  redemption  amount or
interest  under this Deed of  Covenant  for  United  States  federal  income tax
purposes if such  beneficial  owner  would not have been  entitled to payment of
additional amounts had such beneficial owner been the Accountholder,  or (ii) to
any Accountholder who is a United States Person.

For the purposes of this Clause 5, "United  States  Person" means any citizen or
resident  of the United  States,  a  corporation,  partnership  or other  entity
created or organised  in or under the laws of the United  States or, in the case
of a partnership,  otherwise treated as a United States partnership  pursuant to
the United States Treasury  Department  regulations under Section  7701(a)(4) of
the Internal Revenue Code of 1986, as amended,  an estate the income of which is
subject to United States federal income tax regardless of its source, a trust if
(a) a court  within the United  States is able to exercise  primary  supervision
over the  administration  of the trust and (b) one or more United States persons
have the  authority to control all  substantial  decisions of the trust,  or any
other  person  whose  income  or gain  with  respect  to a Note  is  effectively
connected with the conduct of a United States trade or business.

6. Stamp Duties

The  Issuer  shall  pay all  stamp,  registration  and other  taxes  and  duties
(including any interest and penalties thereon or in connection  therewith) which
are payable in the United  States of America and the United  Kingdom  upon or in
connection  with the  execution  and  delivery  of this Deed of  Covenant or the
enforcement thereof,  and shall indemnify each Accountholder  against any claim,
demand, action,  liability,  damages, cost, loss or expense (including,  without
limitation, legal fees and any


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applicable  value added tax) which it incurs as a result or arising out of or in
relation  to any  failure  of the Issuer to pay or delay by the Issuer in paying
any of the same.

7. Benefit of Deed of Covenant

7.01 Deed poll:  This Deed of Covenant  shall take effect as a deed poll for the
benefit of the Accountholders from time to time.

7.02  Benefit:  This  Deed  of  Covenant  shall  enure  to the  benefit  of each
Accountholder and its (and any subsequent) successors and assigns, each of which
shall be entitled severally to enforce this Deed of Covenant against the Issuer.

7.03  Assignment:  The Issuer shall not be entitled to assign or transfer all or
any of its rights, benefits and obligations hereunder.  Each Accountholder shall
be entitled to assign all or any of its rights and benefits hereunder.

8. Partial Invalidity

If  at  any  time  any  provision  hereof  is or  becomes  illegal,  invalid  or
unenforceable  in any respect  under the laws of any  jurisdiction,  neither the
legality,  validity or enforceability of the remaining provisions hereof nor the
legality,  validity or  enforceability  of such provision  under the laws of any
other jurisdiction shall in any way be affected or impaired thereby.

9. Notices

9.01 Address for  notices:  All notices and other  communications  to the Issuer
hereunder  shall be made in writing (by letter,  telex or fax) and shall be sent
to the Issuer at:

                  437 Madison Avenue
                  New York, New York 10022

                  USA

                  Fax:         +212 415 3530

                  Attention:   Treasurer

or to such other  address,  telex  number or fax number or for the  attention of
such other person or department as the Issuer has notified to the Noteholders in
the manner prescribed for the giving of notices in connection with the Notes.

9.02 Effectiveness:  Every notice or other communication sent in accordance with
Clause 9.01 shall be effective as follows:

      (a)   if sent by letter or fax, upon receipt by the Issuer; and

      (b)   if sent  by  telex,  upon  receipt  by the  sender  of the  Issuer's
            answerback at the end of transmission;


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provided,  however,  that any such  notice or other  communication  which  would
otherwise  take  effect  after 4.00 p.m.  on any  particular  day shall not take
effect until 10.00 a.m. on the immediately  succeeding business day in the place
of the Issuer.

9.03 Notices to Accountholders:  Notices to the Accountholders shall be valid if
published in a daily  leading  newspaper  having  general  circulation  in Paris
(which is expected to be either les Echos or La Tribune  Desfosses)  or, if such
publication is not  practicable,  in a leading English  language daily newspaper
having general  circulation  in Europe.  Any such notice shall be deemed to have
been given on the date of first publication.

10. Law and Jurisdiction

10.01  Governing  law:  This  Deed of  Covenant  is  governed  by,  and shall be
construed in accordance with, English law.

10.02 Jurisdiction: The Issuer agrees for the benefit of the Accountholders that
the courts of England  shall have  jurisdiction  to hear and determine any suit,
action or proceedings,  and to settle any disputes, which may arise out of or in
connection  with  this  Deed  of  Covenant   (respectively,   "Proceedings"  and
"Disputes") and, for such purposes,  irrevocably  submits to the jurisdiction of
such courts.

10.03 Appropriate  forum: The Issuer  irrevocably  waives any objection which it
might now or  hereafter  have to the courts of England  being  nominated  as the
forum to hear and determine  any  Proceedings  and to settle any  Disputes,  and
agrees  not to claim  that any such  court is not a  convenient  or  appropriate
forum.

10.04 Process agent: The Issuer agrees that the process by which any Proceedings
in England are begun may be served on it by being  delivered to Omnicom  Finance
Limited  of 239 Old  Marylebone  Road,  London  NW1 5QT or,  if  different,  its
registered  office for the time being or at any address at which  process may be
served on it in  accordance  with Part XXIII of the  Companies Act 1985. If such
person is not or ceases to be effectively appointed to accept service of process
on the  Issuer's  behalf,  the  Issuer  shall,  on  the  written  demand  of any
Accountholder  addressed  to the  Issuer and  delivered  to the Issuer or to the
Specified  Office of the Fiscal  Agent,  appoint a further  person in England to
accept service of process on its behalf.

10.04  Non-exclusivity:  The  submission  to the  jurisdiction  of the courts of
England  shall not (and shall not be  construed so as to) limit the right of the
Accountholders to take Proceedings in any other court of competent jurisdiction,
nor shall the taking of  Proceedings in any one or more  jurisdictions  preclude
the taking of Proceedings in any other  jurisdiction  (whether  concurrently  or
not) if and to the extent permitted by law.

11. Modification

The Fiscal  Agency  Agreement  contains  provisions  for  convening  meetings of
Noteholders  to  consider   matters   relating  to  the  Notes,   including  the
modification  of any provision of this Deed of Covenant.  Any such  modification
may be  made  by  supplemental  deed  poll  if  sanctioned  by an  Extraordinary
Resolution and shall be binding on all Accountholders.


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IN WITNESS  whereof this Deed of Covenant has been executed by the Issuer and is
intended to be and is hereby delivered on the date first before written.


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EXECUTED as a deed                )
by OMNICOM GROUP INC.             )                                DENIS STREIFF
acting by DENIS STREIFF           )

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