<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 SIX MONTHS  ENDED JUNE 30, 1998 AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER>                                   1,000
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                              DEC-31-1998
<PERIOD-END>                                   JUN-30-1998
<CASH>                                             337,918
<SECURITIES>                                        36,620
<RECEIVABLES>                                    2,393,592
<ALLOWANCES>                                        38,703
<INVENTORY>                                              0
<CURRENT-ASSETS>                                 3,451,138
<PP&E>                                             671,129
<DEPRECIATION>                                     364,452
<TOTAL-ASSETS>                                   6,150,574
<CURRENT-LIABILITIES>                            3,930,260
<BONDS>                                            837,924
<PREFERRED-MANDATORY>                                    0
<PREFERRED>                                              0
<COMMON>                                            88,624
<OTHER-SE>                                         990,111
<TOTAL-LIABILITY-AND-EQUITY>                     6,150,574
<SALES>                                                  0
<TOTAL-REVENUES>                                 1,912,486
<CGS>                                                    0
<TOTAL-COSTS>                                    1,121,635
<OTHER-EXPENSES>                                   516,865
<LOSS-PROVISION>                                     3,907
<INTEREST-EXPENSE>                                  32,216
<INCOME-PRETAX>                                    255,888
<INCOME-TAX>                                       107,763
<INCOME-CONTINUING>                                136,895
<DISCONTINUED>                                           0
<EXTRAORDINARY>                                          0
<CHANGES>                                                0
<NET-INCOME>                                       136,895
<EPS-PRIMARY>                                         0.83
<EPS-DILUTED>                                         0.81