EXHIBIT 24

                               Power of Attorney

     Know all men by these presents, that the undersigned, a director of Omnicom
Group Inc., a New York corporation  ("Omnicom"),  constitutes and appoints Bruce
Crawford  and  Raymond  E.  McGovern,  and  each of them,  his  true and  lawful
attorney-in-fact  and agent,  with full and several  power of  substitution  and
resubstitution,  for  him  and in his  name,  place  and  stead,  in any and all
capacities,  to sign the Annual  Report on Form 10-K to be filed by Omnicom  for
the fiscal year ended December 31, 1993 including any or all amendments thereto,
and to file  the  same,  with all  exhibits  thereto,  and  other  documents  in
connection therewith,  including  specifically this Power of Attorney,  with the
Securities and Exchange  Commission,  granting unto said  attorneys-in-fact  and
agents full power and  authority  to do and perform each and every act and thing
requisite and  necessary to be done in and about the  premises,  as fully to all
intents and  purposes as he might or could do in person,  hereby  ratifying  and
confirming  all that said  attorneys-in-fact  and  agents or his  substitute  or
substitutes, may lawfully do or cause to be done by virtue hereof.

Dated   March 28, 1994                            /s/ Bernard Brochand
                                                  ---------------------------
                                                  Bernard Brochand



                               Power of Attorney

     Know all men by these presents, that the undersigned, a director of Omnicom
Group Inc., a New York corporation  ("Omnicom"),  constitutes and appoints Bruce
Crawford  and  Raymond  E.  McGovern,  and  each of them,  his  true and  lawful
attorney-in-fact  and agent,  with full and several  power of  substitution  and
resubstitution,  for  him  and in his  name,  place  and  stead,  in any and all
capacities,  to sign the Annual  Report on Form 10-K to be filed by Omnicom  for
the fiscal year ended December 31, 1993 including any or all amendments thereto,
and to file  the  same,  with all  exhibits  thereto,  and  other  documents  in
connection therewith,  including  specifically this Power of Attorney,  with the
Securities and Exchange  Commission,  granting unto said  attorneys-in-fact  and
agents full power and  authority  to do and perform each and every act and thing
requisite and  necessary to be done in and about the  premises,  as fully to all
intents and  purposes as he might or could do in person,  hereby  ratifying  and
confirming  all that said  attorneys-in-fact  and  agents or his  substitute  or
substitutes, may lawfully do or cause to be done by virtue hereof.

Dated   March 28, 1994                            /s/ Robert J. Callander
                                                  ---------------------------
                                                  Robert J. Callander



                                       2



                               Power of Attorney

     Know all men by these presents, that the undersigned, a director of Omnicom
Group Inc., a New York corporation  ("Omnicom"),  constitutes and appoints Bruce
Crawford  and  Raymond  E.  McGovern,  and  each of them,  his  true and  lawful
attorney-in-fact  and agent,  with full and several  power of  substitution  and
resubstitution,  for  him  and in his  name,  place  and  stead,  in any and all
capacities,  to sign the Annual  Report on Form 10-K to be filed by Omnicom  for
the fiscal year ended December 31, 1993 including any or all amendments thereto,
and to file  the  same,  with all  exhibits  thereto,  and  other  documents  in
connection therewith,  including  specifically this Power of Attorney,  with the
Securities and Exchange  Commission,  granting unto said  attorneys-in-fact  and
agents full power and  authority  to do and perform each and every act and thing
requisite and  necessary to be done in and about the  premises,  as fully to all
intents and  purposes as he might or could do in person,  hereby  ratifying  and
confirming  all that said  attorneys-in-fact  and  agents or his  substitute  or
substitutes, may lawfully do or cause to be done by virtue hereof.

Dated   March 28 , 1994                           /s/ Leonard S. Coleman, Jr.
                                                  ---------------------------
                                                  Leonard S. Coleman, Jr.





                                       3


                               Power of Attorney

     Know all men by these presents, that the undersigned, a director of Omnicom
Group Inc., a New York corporation  ("Omnicom"),  constitutes and appoints Bruce
Crawford  and  Raymond  E.  McGovern,  and  each of them,  his  true and  lawful
attorney-in-fact  and agent,  with full and several  power of  substitution  and
resubstitution,  for  him  and in his  name,  place  and  stead,  in any and all
capacities,  to sign the Annual  Report on Form 10-K to be filed by Omnicom  for
the fiscal year ended December 31, 1993 including any or all amendments thereto,
and to file  the  same,  with all  exhibits  thereto,  and  other  documents  in
connection therewith,  including  specifically this Power of Attorney,  with the
Securities and Exchange  Commission,  granting unto said  attorneys-in-fact  and
agents full power and  authority  to do and perform each and every act and thing
requisite and  necessary to be done in and about the  premises,  as fully to all
intents and  purposes as he might or could do in person,  hereby  ratifying  and
confirming  all that said  attorneys-in-fact  and  agents or his  substitute  or
substitutes, may lawfully do or cause to be done by virtue hereof.

Dated   March 28 , 1994                           /s/ John R. Purcell
                                                  ---------------------------
                                                  John R. Purcell



                                       4



                               Power of Attorney

     Know all men by these presents, that the undersigned, a director of Omnicom
Group Inc., a New York corporation  ("Omnicom"),  constitutes and appoints Bruce
Crawford  and  Raymond  E.  McGovern,  and  each of them,  his  true and  lawful
attorney-in-fact  and agent,  with full and several  power of  substitution  and
resubstitution,  for  him  and in his  name,  place  and  stead,  in any and all
capacities,  to sign the Annual  Report on Form 10-K to be filed by Omnicom  for
the fiscal year ended December 31, 1993 including any or all amendments thereto,
and to file  the  same,  with all  exhibits  thereto,  and  other  documents  in
connection therewith,  including  specifically this Power of Attorney,  with the
Securities and Exchange  Commission,  granting unto said  attorneys-in-fact  and
agents full power and  authority  to do and perform each and every act and thing
requisite and  necessary to be done in and about the  premises,  as fully to all
intents and  purposes as he might or could do in person,  hereby  ratifying  and
confirming  all that said  attorneys-in-fact  and  agents or his  substitute  or
substitutes, may lawfully do or cause to be done by virtue hereof.

Dated   March 28 , 1994                           /s/ Quentin I. Smith, Jr.
                                                  ---------------------------
                                                  Quentin I. Smith, Jr.




                                       5



                               Power of Attorney

     Know all men by these presents, that the undersigned, a director of Omnicom
Group Inc., a New York corporation  ("Omnicom"),  constitutes and appoints Bruce
Crawford  and  Raymond  E.  McGovern,  and  each of them,  his  true and  lawful
attorney-in-fact  and agent,  with full and several  power of  substitution  and
resubstitution,  for  him  and in his  name,  place  and  stead,  in any and all
capacities,  to sign the Annual  Report on Form 10-K to be filed by Omnicom  for
the fiscal year ended December 31, 1993 including any or all amendments thereto,
and to file  the  same,  with all  exhibits  thereto,  and  other  documents  in
connection therewith,  including  specifically this Power of Attorney,  with the
Securities and Exchange  Commission,  granting unto said  attorneys-in-fact  and
agents full power and  authority  to do and perform each and every act and thing
requisite and  necessary to be done in and about the  premises,  as fully to all
intents and  purposes as he might or could do in person,  hereby  ratifying  and
confirming  all that said  attorneys-in-fact  and  agents or his  substitute  or
substitutes, may lawfully do or cause to be done by virtue hereof.

Dated   March 28, 1994                            /s/ Robin B. Smith
                                                  ---------------------------
                                                  Robin B. Smith



                                       6


                               Power of Attorney

     Know all men by these presents, that the undersigned, a director of Omnicom
Group Inc., a New York corporation  ("Omnicom"),  constitutes and appoints Bruce
Crawford  and  Raymond  E.  McGovern,  and  each of them,  his  true and  lawful
attorney-in-fact  and agent,  with full and several  power of  substitution  and
resubstitution,  for  him  and in his  name,  place  and  stead,  in any and all
capacities,  to sign the Annual  Report on Form 10-K to be filed by Omnicom  for
the fiscal year ended December 31, 1993 including any or all amendments thereto,
and to file  the  same,  with all  exhibits  thereto,  and  other  documents  in
connection therewith,  including  specifically this Power of Attorney,  with the
Securities and Exchange  Commission,  granting unto said  attorneys-in-fact  and
agents full power and  authority  to do and perform each and every act and thing
requisite and  necessary to be done in and about the  premises,  as fully to all
intents and  purposes as he might or could do in person,  hereby  ratifying  and
confirming  all that said  attorneys-in-fact  and  agents or his  substitute  or
substitutes, may lawfully do or cause to be done by virtue hereof.

Dated   March 28, 1994                            /s/ Gary L. Roubos
                                                  ---------------------------
                                                  Gary L. Roubos



                                       7


                               Power of Attorney

     Know all men by these presents, that the undersigned, a director of Omnicom
Group Inc., a New York corporation  ("Omnicom"),  constitutes and appoints Bruce
Crawford  and  Raymond  E.  McGovern,  and  each of them,  his  true and  lawful
attorney-in-fact  and agent,  with full and several  power of  substitution  and
resubstitution,  for  him  and in his  name,  place  and  stead,  in any and all
capacities,  to sign the Annual  Report on Form 10-K to be filed by Omnicom  for
the fiscal year ended December 31, 1993 including any or all amendments thereto,
and to file  the  same,  with all  exhibits  thereto,  and  other  documents  in
connection therewith,  including  specifically this Power of Attorney,  with the
Securities and Exchange  Commission,  granting unto said  attorneys-in-fact  and
agents full power and  authority  to do and perform each and every act and thing
requisite and  necessary to be done in and about the  premises,  as fully to all
intents and  purposes as he might or could do in person,  hereby  ratifying  and
confirming  all that said  attorneys-in-fact  and  agents or his  substitute  or
substitutes, may lawfully do or cause to be done by virtue hereof.

Dated   March 28, 1994                            /s/ William G. Tragos
                                                  ---------------------------
                                                  William G. Tragos



                                       8


                               Power of Attorney

     Know all men by these presents, that the undersigned, a director of Omnicom
Group Inc., a New York corporation  ("Omnicom"),  constitutes and appoints Bruce
Crawford  and  Raymond  E.  McGovern,  and  each of them,  his  true and  lawful
attorney-in-fact  and agent,  with full and several  power of  substitution  and
resubstitution,  for  him  and in his  name,  place  and  stead,  in any and all
capacities,  to sign the Annual  Report on Form 10-K to be filed by Omnicom  for
the fiscal year ended December 31, 1993 including any or all amendments thereto,
and to file  the  same,  with all  exhibits  thereto,  and  other  documents  in
connection therewith,  including  specifically this Power of Attorney,  with the
Securities and Exchange  Commission,  granting unto said  attorneys-in-fact  and
agents full power and  authority  to do and perform each and every act and thing
requisite and  necessary to be done in and about the  premises,  as fully to all
intents and  purposes as he might or could do in person,  hereby  ratifying  and
confirming  all that said  attorneys-in-fact  and  agents or his  substitute  or
substitutes, may lawfully do or cause to be done by virtue hereof.

Dated   March 28, 1994                            /s/ Egon P.S. Zehnder
                                                  ---------------------------
                                                  Egon P. S. Zehnder



                                       9