<ARTICLE>                     5
<LEGEND>
      THIS SCHEDULE  CONTAINS SUMMARY FINANCIAL  INFORMATION  EXTRACTED FROM THE
CONSOLIDATED   CONDENSED   FINANCIAL   STATEMENTS  OF  OMNICOM  GROUP  INC.  AND
SUBSIDIARIES  AS OF AND FOR THE NINE  MONTHS  ENDED  SEPTEMBER  30,  1998 AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER>                                   1,000
       
                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-END>                               SEP-30-1998
<CASH>                                         313,234
<SECURITIES>                                    34,271
<RECEIVABLES>                                2,329,673
<ALLOWANCES>                                    43,333
<INVENTORY>                                          0
<CURRENT-ASSETS>                             3,349,458
<PP&E>                                         690,495
<DEPRECIATION>                                 388,967
<TOTAL-ASSETS>                               6,224,337
<CURRENT-LIABILITIES>                        3,765,785
<BONDS>                                      1,068,103
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        88,656
<OTHER-SE>                                     978,721
<TOTAL-LIABILITY-AND-EQUITY>                 6,224,337
<SALES>                                              0
<TOTAL-REVENUES>                             2,894,063
<CGS>                                                0
<TOTAL-COSTS>                                1,708,881
<OTHER-EXPENSES>                               800,176
<LOSS-PROVISION>                                 6,135
<INTEREST-EXPENSE>                              50,151
<INCOME-PRETAX>                                355,402
<INCOME-TAX>                                   149,969
<INCOME-CONTINUING>                            190,687
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   190,687
<EPS-PRIMARY>                                     1.15
<EPS-DILUTED>                                     1.13