

              [LETTERHEAD OF McDONALD & COMPANY SECURITIES, INC.]

                                    CONSENT

     McDonald & Company Securities, Inc. hereby consents to the summarization of
its fairness opinion to Ross Roy Communications, Inc., dated as of May 21, 1995,
as such  summarization  appears  in the  Registration  Statement  on Form S-4 of
Omnicom Group Inc. as filed with the Securities and Exchange  Commission on June
19,  1995.  McDonald & Company  Securities  Inc.  also hereby  consents to allow
fairness opinion to be filed as an exhibit to the Registration Statement on Form
S-4.

                                        /s/ MCDONALD & COMPANY SECURITIES, INC.
                                            MCDONALD & COMPANY SECURITIES, INC.

Dated: June 19, 1995

