SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                   ----------

                                    FORM 10-Q

                                   ----------

(Mark One)

     [X]  QUARTERLY  REPORT  PURSUANT TO SECTION 13 OR 15 (d) OF THE  SECURITIES
          EXCHANGE ACT OF 1934

          For the Quarterly Period Ended: March 31, 2003

                                       OR

     [ ]  TRANSITION  REPORT  PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES
          EXCHANGE ACT OF 1934

          For the transition period from _____________ to ____________

          Commission File Number: 1-10551


                               OMNICOM GROUP INC.
- --------------------------------------------------------------------------------
             (Exact name of registrant as specified in its charter)

             New York                                     13-1514814
- --------------------------------------------------------------------------------
(State or other jurisdiction of             (IRS Employer Identification Number)
incorporation or organization)

  437 Madison Avenue, New York, New York                           10022
- --------------------------------------------------------------------------------
 (Address of principal executive offices)                        (Zip Code)

                                 (212) 415-3600
- --------------------------------------------------------------------------------
              (Registrant's telephone number, including area code)

                                 Not Applicable
- --------------------------------------------------------------------------------
              (Former name, former address and former fiscal year,
                         if changed since last report)

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months (or for such shorter period that the registrant was
required to file such reports and (2) has been subject to such filing
requirements for the past 90 days. YES  X     NO ___
                                       ---

Indicate  by check mark  whether  the  registrant  is an  accelerated  filer (as
defined  in  Rule  12  b-2  of  the   Exchange   Act).   YES  X     NO ___
                                                             ---

Indicate the number of shares  outstanding  of each of the  issuer's  classes of
common stock, as of the latest  practicable  date.  188,520,800 (as of April 30,
2003)




                       OMNICOM GROUP INC. AND SUBSIDIAIRES
                                      INDEX

PART I.      FINANCIAL INFORMATION

                                                                        Page No.
                                                                        --------
  Item 1.    Financial Statements

             Consolidated Condensed Balance Sheets -
                  March 31, 2003 and December 31, 2002.....................    1

             Consolidated Condensed Statements of Income -
                  Three Months Ended March 31, 2003 and 2002...............    2

             Consolidated Condensed Statements of Cash Flows -
                  Three Months Ended March 31, 2003 and 2002...............    3

             Notes to Consolidated Condensed Financial Statements..........    4

  Item 2.    Management's Discussion and Analysis of Financial Condition
             And Results of Operations.....................................    8

  Item 3.    Quantitative and Qualitative Disclosures About Market Risk....   15

  Item 4.    Controls and Procedures.......................................   16

PART II.     OTHER INFORMATION

 Item 6.     Exhibits and Reports on Form 8-K..............................   17

             Signatures....................................................   18

             Certifications of Senior Executive Officers...................   19



                       OMNICOM GROUP INC. AND SUBSIDIARIES
                      CONSOLIDATED CONDENSED BALANCE SHEETS
                             (Dollars in Thousands)


                                                                       (Unaudited)
                                                                        March 31,       December 31,
                                                                          2003             2002
                                                                          ----             ----
                                     ASSETS
                                                                                     
CURRENT ASSETS:
     Cash and cash equivalents ....................................   $    354,563         666,951
     Short-term investments at market, which approximates cost ....         26,085          28,930
     Accounts receivable, less allowance for doubtful accounts
        of $68,966 and $75,575 ....................................      4,027,396       3,966,550
     Billable production orders in process, at cost ...............        492,023         371,816
     Prepaid expenses and other current assets ....................        673,749         602,819
                                                                      ------------    ------------
                  Total Current Assets ............................      5,573,816       5,637,066
                                                                      ------------    ------------

FURNITURE, EQUIPMENT AND LEASEHOLD IMPROVEMENTS, at cost,
     less accumulated depreciation and amortization of
     $731,292 and $717,294 ........................................        559,371         557,735
INVESTMENTS IN AFFILIATES .........................................        141,734         137,303
GOODWILL ..........................................................      4,900,160       4,850,829
INTANGIBLES, net of accumulated amortization of $92,377 and $88,132        103,316          97,730
DEFERRED TAX BENEFITS .............................................         45,591          42,539
OTHER ASSETS ......................................................        491,126         496,600
                                                                      ------------    ------------
                  TOTAL ASSETS ....................................   $ 11,815,114    $ 11,819,802
                                                                      ============    ============


                      LIABILITIES AND SHAREHOLDERS' EQUITY
CURRENT LIABILITIES:
     Accounts payable .............................................   $  4,260,470    $  4,833,681
     Advance billings .............................................        670,820         648,577
     Current portion of long-term debt ............................          6,069          35,256
     Bank loans ...................................................         95,906          50,394
     Accrued taxes and other liabilities ..........................      1,221,008       1,271,616
                                                                      ------------    ------------
                  Total Current Liabilities .......................      6,254,273       6,839,524
                                                                      ------------    ------------

LONG-TERM DEBT ....................................................        633,034         197,861
CONVERTIBLE NOTES .................................................      1,747,037       1,747,037
DEFERRED COMPENSATION AND OTHER LIABILITIES .......................        303,686         293,638
MINORITY INTERESTS ................................................        179,049         172,815

SHAREHOLDERS' EQUITY:
     Common stock .................................................         29,790          29,790
     Additional paid-in capital ...................................      1,415,345       1,419,910
     Retained earnings ............................................      2,205,801       2,114,506
     Unamortized restricted stock .................................       (124,206)       (136,357)
     Accumulated other comprehensive loss .........................       (136,699)       (154,142)
     Treasury stock ...............................................       (691,996)       (704,780)
                                                                      ------------    ------------
                  Total Shareholders' Equity ......................      2,698,035       2,568,927
                                                                      ------------    ------------

                  TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY ......   $ 11,815,114    $ 11,819,802
                                                                      ============    ============

           The accompanying notes to consolidated condensed financial
              statements are an integral part of these statements.


                                       1


                       OMNICOM GROUP INC. AND SUBSIDIARIES
                   CONSOLIDATED CONDENSED STATEMENTS OF INCOME
                  (Dollars in Thousands, Except Per Share Data)
                                   (Unaudited)

                                                   Three Months Ended March 31,
                                                 -------------------------------
                                                    2003                  2002
                                                    ----                  ----

REVENUE ..................................       $ 1,937,245        $ 1,732,426

OPERATING EXPENSES:
    Salary and service costs .............         1,340,759          1,172,538
    Office and general expenses ..........           373,132            331,029
                                                 -----------        -----------

                                                   1,713,891          1,503,567
                                                 -----------        -----------

OPERATING PROFIT .........................           223,354            228,859

NET INTEREST EXPENSE:
    Interest expense .....................            11,220             13,852
    Interest income ......................            (2,952)            (2,529)
                                                 -----------        -----------

                                                       8,268             11,323
                                                 -----------        -----------

INCOME BEFORE INCOME TAXES ...............           215,086            217,536

INCOME TAXES .............................            75,211             79,858
                                                 -----------        -----------

INCOME AFTER INCOME TAXES ................           139,875            137,678

EQUITY IN AFFILIATES .....................             2,486              2,522

MINORITY INTERESTS .......................           (13,777)           (11,634)
                                                 -----------        -----------

        NET INCOME .......................       $   128,584        $   128,566
                                                 ===========        ===========


NET INCOME PER COMMON SHARE:

        Basic.............................       $  0. 69             $    0.69
        Diluted...........................       $  0. 69             $    0.68


DIVIDENDS DECLARED PER COMMON SHARE.......       $  0.200             $   0.200

           The accompanying notes to consolidated condensed financial
              statements are an integral part of these statements.


                                       2


                       OMNICOM GROUP INC. AND SUBSIDIARIES
                 CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS
                             (Dollars in Thousands)
                                   (Unaudited)



                                                                             Three Months Ended March 31,
                                                                             ----------------------------
                                                                                 2003          2002
                                                                                 ----          ----
                                                                                      
Cash flows from operating activities:
Net income ...............................................................   $   128,584    $   128,566
     Adjustments to reconcile net income to net cash provided
        by operating activities:
     Depreciation tangible assets ........................................        29,948         30,244
     Amortization of intangible assets ...................................         7,613          3,309
     Minority interests ..................................................        13,777         11,634
     Earnings of affiliates less than dividends received .................         1,251          1,082
     Tax benefit on employee stock plans .................................         1,065         10,775
     (Reductions) provisions for losses on accounts receivable ...........          (851)         1,168
     Amortization of restricted shares ...................................         9,776         15,554
     Increase in accounts receivable .....................................       (18,948)       (33,976)
     Increase in billable production orders in process ...................      (117,565)      (105,538)
     Increase in prepaid expenses and other current assets ...............       (65,050)       (46,150)
     Decrease (increase) in other assets, net ............................         8,801        (41,377)
     Net decrease in advance billings, accrued taxes and other liabilities       (48,532)      (255,742)
     Decrease in accounts payable ........................................      (613,663)      (477,737)
                                                                             -----------    -----------
        Net cash used for operating activities ...........................      (663,794)      (758,188)
                                                                             -----------    -----------
Cash flows from investing activities:
     Capital expenditures ................................................       (28,988)       (32,266)
     Payments for purchases of equity interests in subsidiaries and
        affiliates, net of cash acquired .................................       (22,044)      (106,892)
     Purchases of short-term investments .................................        (1,748)       (12,553)
     Proceeds from sale of short-term investments ........................         5,043         10,400
                                                                             -----------    -----------
        Net cash used in investing activities ............................       (47,737)      (141,311)
                                                                             -----------    -----------
Cash flows from financing activities:
     Net increase in short-term borrowings ...............................        43,448         36,625
     Net proceeds from issuance of debt and convertible debentures .......       427,354      1,310,438
     Repayments of principal of long-term debt obligations ...............       (29,677)       (13,842)
     Dividends paid ......................................................       (37,211)       (36,810)
     Purchase of treasury shares .........................................          --         (368,780)
     Other, net ..........................................................         2,726          9,666
                                                                             -----------    -----------
        Net cash provided by financing activities ........................       406,640        937,297
                                                                             -----------    -----------
Effect of exchange rate changes on cash and cash equivalents .............        (7,497)        (8,238)
                                                                             -----------    -----------
        Net (decrease) increase in cash and cash equivalents .............      (312,388)        29,560
Cash and cash equivalents at beginning of period .........................       666,951        472,151
                                                                             -----------    -----------
Cash and cash equivalents at end of period ...............................   $   354,563    $   501,711
                                                                             ===========    ===========

Supplemental disclosures:
     Income taxes paid ...................................................   $   115,483    $   140,218
     Interest paid .......................................................   $    11,044    $     9,037


           The accompanying notes to consolidated condensed financial
              statements are an integral part of these statements.


                                       3


                       OMNICOM GROUP INC. AND SUBSIDIAIRES
              NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS

1.   We have prepared the consolidated  condensed interim  financial  statements
     included   herein   without  audit  pursuant  to  Securities  and  Exchange
     Commission rules.  Certain  information and footnote  disclosures  normally
     included in financial  statements  prepared in  accordance  with  generally
     accepted  accounting  principles  ("GAAP")  have been  condensed or omitted
     pursuant to these rules.

2.   The accompanying  financial statements reflect all adjustments,  consisting
     of normally  recurring  accruals,  which in the opinion of  management  are
     necessary  for a  fair  presentation,  in  all  material  respects,  of the
     information contained therein. Certain  reclassifications have been made to
     the March 31, 2002 and December 31, 2002  reported  amounts to conform them
     to the March 31,  2003  presentation.  These  statements  should be read in
     conjunction  with the consolidated  financial  statements and related notes
     included in our annual report on Form 10-K for the year ended  December 31,
     2002.

3.   Results of operations for interim periods are not necessarily indicative of
     annual results.

4.   Basic  earnings  per share is based  upon the  weighted  average  number of
     common shares outstanding during the period.  Diluted earnings per share is
     based on the above,  plus,  if  dilutive,  common share  equivalents  which
     include  outstanding  options and restricted shares, some of which were not
     dilutive  for the  periods  presented.  No  adjustments  were  made for our
     zero-coupon convertible notes because the conversion criteria have not been
     met.  For  purposes of computing  diluted  earnings per share,  773,000 and
     2,819,000  common share  equivalents were assumed to be outstanding for the
     three months ended March 31, 2003 and 2002, respectively.

          The  assumed   increase  in  net  income  related  to  the  after  tax
     compensation expense related to dividends on restricted shares was $240,000
     and  $271,000  for  the  three  months  ended  March  31,  2003  and  2002,
     respectively. The number of shares used in our EPS computations were:

                                                           Three Months
                                                           Ended March 31,
                                                 -------------------------------
                                                    2003                   2002
                                                    ----                   ----
     Basic EPS Computation                      186,556,000         186,671,000
     Diluted EPS Computation                    187,329,000         189,490,000


                                       4


                       OMNICOM GROUP INC. AND SUBSIDIAIRES
        NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS (Continued)

5.   Total comprehensive income and its components were:

                                                       (in thousands of dollars)
                                                       -------------------------
                                                          Three Months Ended
                                                                 March 31,
                                                         -----------------------
                                                           2003          2002
                                                           ----          ----

Net income for the period ...........................    $ 128,584    $ 128,566

Foreign currency translation adjustment, net of
income taxes of $9,392 and $16,943
in 2003 and 2002, respectively ......................       17,443      (29,224)
                                                         ---------    ---------
Comprehensive income for the period .................    $ 146,027    $  99,342
                                                         =========    =========

6.   The  following  pronouncements  were  issued  by the  Financial  Accounting
     Standards  Board  ("FASB")  in  2002:  Statement  of  Financial  Accounting
     Standards No. 146,  Accounting for Costs  Associated  with Exit or Disposal
     Activities (SFAS 146); and Statement of Financial  Accounting Standards No.
     148, Accounting for Stock-Based  Compensation - Transition and Disclosure -
     An Amendment of FASB No. 123 (SFAS 148).

          SFAS 146 requires costs associated with exit or disposal activities be
     recognized and measured  initially at fair value only when the liability is
     incurred.  SFAS  146 is  effective  for  exit or  disposal  costs  that are
     initiated after December 31, 2002. We adopted SFAS 146 effective January 1,
     2003.  The adoption did not have an impact on our  consolidated  results of
     operations or financial position.

          SFAS 148 was issued as an  amendment to FASB No. 123,  Accounting  for
     Stock-Based  Compensation,  and provides  alternative methods of transition
     for an entity that  voluntarily  changes to the fair value based  method of
     accounting for stock-based  employee  compensation (in accordance with SFAS
     123).  We have  applied the  accounting  provisions  of APB Opinion No. 25,
     "Accounting for Stock Issued to Employees", and we have made the annual pro
     forma  disclosures  of the  effect of  adopting  the fair  value  method of
     accounting for employee  stock options and similar  instruments as required
     under  SFAS 123 and SFAS 148.  We have  adopted  the  quarterly  disclosure
     requirement  as required under SFAS 148 during the first quarter of 2003 as
     set  forth in note 7 below.  This  disclosure  requirement  did not have an
     impact on our consolidated results of operations or financial position. The
     FASB recently indicated that they will issue a new accounting standard that
     will require stock-based  employee  compensation to be recorded as a charge
     to earnings  beginning in 2004. We will continue to monitor the progress of
     the FASB with regard to the issuance of this standard.

          FIN 45 sets forth the  disclosures  to be made by a  guarantor  in its
     interim  and  annual  financial  statements  about  its  obligations  under
     guarantees  issued.  FIN 45 also  clarifies that a guarantor is required to
     recognize,  at inception of a guarantee,  a liability for the fair


                                       5


                       OMNICOM GROUP INC. AND SUBSIDIAIRES
        NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS (Continued)

     value of the obligation undertaken.  The application of FIN 45 did not have
     an impact on, or result in  additional  disclosure,  in our March 31,  2003
     consolidated results of operations or financial position.

          FIN 46 addresses the consolidation by business enterprises of variable
     interest  entities,  as defined in FIN 46 and is based on the concept  that
     companies that control another entity through interests,  other than voting
     interests,  should  consolidate the controlled  entity.  The  consolidation
     requirements  apply  immediately  to  FIN 46  interests  held  in  variable
     interest  entities created after January 31, 2003, and to interests held in
     variable  interest  entities  that  existed  prior to  February 1, 2003 and
     remain in existence as of July 1, 2003.  The  application of FIN 46 did not
     have an impact  on, or result in  additional  disclosure  in, our March 31,
     2003 consolidated results of operations or financial position.

7.   The table below  summarizes  the quarterly pro forma effect of adopting the
     fair value  method of  accounting  for employee  stock  options and similar
     instruments.

                                                       (in thousands of dollars,
                                                       except per share amounts)
                                                       -------------------------
                                                       1st Quarter   1st Quarter
                                                          2003          2002
                                                       -----------   -----------

Net income, as reported ............................    $128,584     $128,566
Net income, pro forma ..............................     115,154      102,441
Stock-based employee compensation cost,
       net of tax, as reported .....................       8,095        7,554
Additional stock-based employee compensation cost,
       net of tax, pro forma .......................      13,430       26,125

Basic net income per share, as reported ............        0.69         0.69
Basic net income per share, pro forma ..............        0.62         0.55

Diluted net income per share, as reported ..........        0.69         0.68
Diluted net income per share, pro forma ............        0.62         0.55


                                       6


                       OMNICOM GROUP INC. AND SUBSIDIAIRES
        NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS (Continued)

8.   All of our  wholly  and  partially  owned  businesses  operate  within  the
     marketing and corporate  communications  services industry.  These agencies
     are organized into strategic platforms, client centric networks, geographic
     regions  and  operating  groups.  Our  businesses  provide   communications
     services to similar  type  clients on a global,  pan-regional  and national
     basis. The businesses have similar cost structures,  and are subject to the
     same general economic and competitive risks. Given these  similarities,  we
     aggregate their results into one reportable segment.

          A summary of our revenue and long-lived  assets by geographic area for
     the  three  months  ended  March  31,  2003 and 2002 is  summarized  in the
     following table.

                                     (in thousands of dollars)
                       ---------------------------------------------------------
                       United        Euro     United      Other
                       States    Denominated  Kingdom International Consolidated
                       ------    -----------  ------- ------------- ------------
2003
Revenue ...........  $1,099,575   $388,051   $210,911    $238,708    $1,937,245
Long-Lived Assets .     317,125     80,839     82,633      78,774       559,371

2002
Revenue ...........  $1,022,129   $319,894   $182,903    $207,500    $1,732,426
Long-Lived Assets .     329,468     63,248     89,375      74,720       556,811

9.   Amounts outstanding under our revolving credit facilities at March 31, 2003
     include loans of $100.0 million. Additionally, $350.4 million of commercial
     paper was outstanding. Both are classified as long-term debt.

          We also had short-term  bank loans of $95.9 million at March 31, 2003,
     comprised of domestic  borrowings and bank overdrafts of our  international
     subsidiaries which are unsecured loans.

          At March 31, 2003, we had committed unsecured credit lines aggregating
     $1,893.0  million.  The unused  portion of our  credit  lines was  $1,410.0
     million at March 31, 2003.

10.  On February 3, 2003,  we offered to pay holders of our Liquid  Yield Option
     Notes due in 2031, $30 per $1,000 principal amount of notes as an incentive
     to the holders not to exercise  their put right.  We paid $25.4  million to
     qualified  noteholders  on  February  21,  2003,  which is being  amortized
     ratably  over  the  next  year.  In  addition,  on  February  7,  2003,  we
     repurchased for cash,  notes from holders who exercised their put right for
     $2.9 million,  reducing the aggregate  amount  outstanding of the notes due
     2031 to $847.0 million.


                                       7


ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITIONS AND RESULTS
        OF OPERATIONS (Continued)

Results of Operations

First Quarter 2003 Compared to First Quarter 2002

     Revenue: Our first quarter of 2003 consolidated worldwide revenue increased
11.8% to  $1,937.2  million  from  $1,732.4  million  in  2002.  The  effect  of
acquisitions,  net of disposals, increased worldwide revenue by $52.7 million in
the first quarter of 2003.  Internal/organic  growth increased worldwide revenue
by $44.8 million,  and foreign exchange impacts  increased  worldwide revenue by
$107.3  million.  The components of the first quarter 2003 revenue growth in the
U.S.  ("domestic")  and  the  remainder  of  the  world   ("international")  are
summarized below ($ in millions):



                                               Total                  Domestic            International
                                        -----------------        -----------------       ---------------
                                             $         %             $          %          $          %
                                        --------      ---        --------      ---       ------      ---

                                                                                   
March 31, 2002.......................   $1,732.4      --         $1,022.2      --        $710.2      --

Components of Revenue Changes:

Foreign exchange impact..............      107.3      6.2%            --       --         107.3     15.1%
Acquisitions.........................       52.7      3.0%           33.4     3.3%         19.3      2.7%
Organic..............................       44.8      2.6%           44.0     4.3%          0.8      0.1%
                                         -------      ---         -------     ---        ------      ---

March 31, 2003.......................   $1,937.2      11.8%      $1,099.6     7.6%       $837.6     17.9%
                                        ========      ====       ========     ===        ======     ====


The components and percentages are calculated as follows:

     o    The foreign exchange impact component shown in the table is calculated
          by first  converting the current period's local currency revenue using
          the average  exchange rates from the equivalent prior period to arrive
          at a constant  currency revenue (in this case $1,829.9 million for the
          Total column in the table).  The foreign  exchange  impact  equals the
          difference  between the current period revenue in U.S. dollars and the
          current  period  revenue in constant  currency (in this case  $1,937.2
          million less $1,829.9 million for the Total column in the table).

     o    The  acquisition  component  shown  in  the  table  is  calculated  by
          aggregating  the  applicable  prior  period  revenue  of the  acquired
          businesses.  Netted against this number is the revenue of any business
          included in the prior  period  reported  revenue  that was disposed of
          subsequent to the prior period.

     o    The organic  component shown in the table is calculated by subtracting
          both the foreign  exchange and  acquisition  revenue  components  from
          total revenue growth.

     o    The  percentage  change  shown  in the  table  of  each  component  is
          calculated by dividing the  individual  component  amount by the prior
          period revenue base of that  component (in this case $1,732.4  million
          for the Total column in the table).


                                       8


ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITIONS AND RESULTS
        OF OPERATIONS (Continued)

     The  components of revenue and revenue growth for the first quarter of 2003
compared to the first  quarter of 2002,  in our primary  geographic  markets are
summarized below ($ in millions):

                                                  $ Revenue    % Growth
                                                  ---------    --------
         United States.......................     $1,099.6       7.6%
         Euro Markets........................        388.1      21.3%
         United Kingdom......................        210.9      15.3%
         Other...............................        238.6      15.0%
                                                   -------      ----

         Total...............................     $1,937.2      11.8%
                                                  ========      ====

     As indicated,  foreign exchange impacts increased our international revenue
by $107.3 million during the quarter ended March 31, 2003. The most  significant
impacts  resulted from the continued  strength of the Euro and the British Pound
against  the  U.S.  dollar,  as our  operations  in  these  markets  represented
approximately 70.0% of our international revenue.

     The current  geopolitical  uncertainty  combined  with the  prolonged  weak
economic  conditions have created a challenging  business climate.  As a result,
management  believes that the overall demand for advertising and other marketing
and  corporate  communications  services  in the near term will  continue  to be
difficult to predict.

     Several  long-term  trends  continue  to  positively  affect our  business,
including our clients increasingly expanding the focus of their brand strategies
from national markets to the global market.  Additionally,  in an effort to gain
greater efficiency and effectiveness  from their marketing dollars,  clients are
increasingly requiring greater coordination of their traditional advertising and
marketing activities and concentrating these activities with a smaller number of
service providers.

     Driven by  clients'  continuous  demand for more  effective  and  efficient
branding  activities,  we strive to provide an extensive  range of marketing and
corporate  communications  services through various client centric networks that
are  organized  to meet  specific  client  objectives.  These  services  include
advertising,  brand  consultancy,  crisis  communications,   custom  publishing,
database  management,  digital  and  interactive  marketing,  direct  marketing,
directory   advertising,    entertainment   marketing,   environmental   design,
experiential  marketing,  field  marketing,   financial/corporate   business  to
business advertising,  graphic arts, healthcare communications,  instore design,
investor   relations,   marketing   research,   media   planning   and   buying,
multi-cultural marketing,  non-profit marketing,  organizational communications,
package design, product placement, promotional marketing, public affairs, public
relations,  real estate advertising and marketing,  recruitment  communications,
reputation  consulting,  retail marketing and sports and event marketing.  In an
effort to monitor the  changing  needs of our clients and to further  expand the
scope of our services to key clients, we monitor revenue across a broad range of
disciplines and group them into the following four categories: traditional media
advertising,  customer  relationship  management  referred  to  as  CRM,  public
relations and specialty communications as summarized below.


                                       9


ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITIONS AND RESULTS
        OF OPERATIONS (Continued)



                                                                      (Dollars in millions)
                                          -------------------------------------------------------------------
                                          1st Quarter   % of      1st Quarter   % of          $          %
                                             2003      Revenue       2002      Revenue      Growth     Growth
                                          ---------    -------     --------    -------      ------     ------
                                                                                     
Traditional media advertising             $  859.7     44.4%       $  777.8     44.9%       $ 81.9     10.5%
CRM                                          631.3     32.6%          522.7     30.2%        108.6     20.8%
Public relations                             225.0     11.6%          227.4     13.1%         (2.4)    (1.1)%
Specialty communications                     221.2     11.4%          204.5     11.8%         16.7      8.2%
                                          --------                 --------                 ------
                                          $1,937.2                 $1,732.4                 $204.8
                                          ========                 ========                 ======


         Operating Expenses: Our first quarter of 2003 worldwide operating
expense increased $210.3 million, or 14.0%, to $1,713.9 million from $1,503.6
million in the first quarter of 2002, as described below.

     Salary and service  costs,  which are comprised of direct service costs and
salary related costs,  increased by $168.2  million,  or 14.3%,  and represented
78.2% of total  operating  expenses in the first quarter of 2003 versus 78.0% in
the first quarter of 2002.  These expenses  increased as a percentage of revenue
to 69.2% in the first  quarter of 2003 from 67.7% in the first  quarter of 2002.
Salary related costs including incentive compensation and bonuses,  decreased as
a percentage  of revenue in the first  quarter of 2003  primarily as a result of
reductions  in  incentive  compensation  and our  continuing  efforts  to  align
permanent  staffing with current work levels on a location by location basis, as
well as our continued attempts to increase the variability of our cost structure
by  relying  more upon  freelance  labor.  This was offset by  increased  direct
service  costs  including  greater  utilization  of freelance  labor,  increased
severance related costs and changes in the mix of our revenues.

     Office and general  expenses  increased by $42.1 million,  or 12.7%, in the
first  quarter of 2003.  Office and general  expenses  represented  21.8% of our
total  operating  costs in the first  quarter of 2003 versus  22.0% in the first
quarter of 2002.  Additionally,  as a percentage  of revenue  office and general
expenses increased  marginally in the first quarter of 2003 to 19.3% from 19.1%.
This relatively consistent year-over-year performance results from our continued
efforts to better  align costs with  business  levels on a  location-by-location
basis.

     For the foregoing reasons,  our operating margin decreased by $5.5 million,
or 2.4% to $223.4 million or 11.5% of revenue in the first quarter of 2003, from
$228.9 million or 13.2% of revenue in the first quarter of 2002.

     Net  Interest  Expense:  Our net  interest  expense  decreased in the first
quarter of 2003 to $8.3 million as compared to $11.3  million in the same period
in 2002. Our gross interest expense  decreased by $2.6 million to $11.2 million.
This  decrease  resulted  from the issuance in March 2002 of the $900.0  million
Zero Coupon Zero Yield Convertible  Notes,  generally lower short-term  interest
rates and cash management efforts during the quarter.  This was partially offset
by  additional  interest  costs  associated  with our  payment of $30 per $1,000
principal  amount of our Liquid  Yield  Option Notes due 2031 as an incentive to
the holders not to exercise their put right.  We paid $25.4 million to qualified
noteholders on February 21, 2003, which is being amortized ratably over the next
year. As a result of the payment made, we expect interest


                                       10


ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITIONS AND RESULTS
        OF OPERATIONS (Continued)

expense to increase by $23.3 million for the full-year 2003 compared to 2002. In
addition,  depending on future market conditions, we may make a similar offer to
holders of the Zero Coupon Zero Yield  Convertible  Notes due 2032 in July 2003.
We cannot  determine  at this  time if such an offer  will be made or, if one is
made, the amount that may be offered or actually paid. If an offer is made and a
payment results,  our interest expense would further increase in the second-half
of 2003 compared to 2002.

     Income Taxes: Our  consolidated  effective income tax rate was 35.0% in the
first quarter of 2003, which is consistent with our full year rate for 2002, but
is less  than the  36.7%  rate in the  first  quarter  of 2002.  This  reduction
reflects the realization of our ongoing focus on tax planning.

     Minority Interests: In the first quarter of 2003, minority interest expense
increased  slightly to $13.8  million from $11.6 million in the first quarter of
2002,  primarily due to higher  earnings by companies  where minority  interests
exist.

     Earnings Per Share (EPS): For the foregoing reasons,  our net income in the
first quarter of 2003, increased marginally to $128.6 million.  Diluted earnings
per share  increased  1.4% to $0.69 in the first quarter of 2003, as compared to
$0.68 in the prior year period.

Critical Accounting Policies and New Accounting Pronouncements

     To assist in better  understanding our financial statements and the related
management's discussion and analysis of those results, readers are encouraged to
consider this  information  together with our discussion of critical  accounting
policies  in the MD&A in our 2002 10-K,  as well as our  consolidated  financial
statements  and the related notes  included in our 2002 10-K for a more complete
understanding of all of our accounting policies.


                                       11


ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITIONS AND RESULTS
        OF OPERATIONS (Continued)

Contingent Acquisition Obligations

     Certain of our  acquisitions  are  structured  with  additional  contingent
purchase price obligations.  We utilize contingent  purchase price structures in
an effort to minimize the risk to the Company  associated with potential  future
negative changes in the performance of the acquired entity. We estimate that the
amount of future contingent purchase price payments,  assuming that the acquired
businesses  perform over the relevant  future  periods at their  current  profit
levels,  that we will be  required  to make for  prior  acquisitions  is  $490.2
million as of March 31, 2003.  The ultimate  amounts  payable are dependent upon
future results,  are subject to changes in foreign currency  exchange rates and,
in accordance with GAAP, we have not recorded a liability for these items on our
balance sheet since the definitive  amount is not determinable or distributable.
Actual  results can differ from these  estimates and the actual  amounts that we
pay are likely to be different from these estimates. Our obligations change from
period to period as a result of payments made during the current period, changes
in the  previous  estimate of the  acquired  entities'  performance,  changes in
foreign currency  exchange rates and other factors.  These  differences could be
material.  We estimate these contingent  purchase price  obligations as of March
31, 2003, are as follows:

                                 ($ in millions)
     ----------------------------------------------------------------
     Remainder                                     There-
       2003         2004       2005       2006      after       Total
       ----         ----       ----       ----      -----       -----
      $231.5      $129.2      $82.6      $28.7      $18.2      $490.2

     In  addition,  owners  of  interests  in  certain  of our  subsidiaries  or
affiliates  have the right in certain  circumstances  to require us to  purchase
additional  ownership  stakes  in  these  subsidiaries  or  affiliates  which we
estimate,  assuming  that  the  subsidiaries  and  affiliates  perform  over the
relevant  periods at their  current  profit  levels,  could require us in future
periods to pay an  additional  aggregate of $242.2  million,  $124.5  million of
which are  currently  exercisable.  The  ultimate  amount  payable in the future
relating to these  transactions  will vary because it is dependent on the future
results of  operations  of the subject  businesses  and the timing of when these
rights are exercised.  The actual amounts that we pay are likely to be different
from these  estimates.  These  differences  could be  material.  We estimate the
obligations that exist for these agreements as of March 31, 2003 are as follows:

                                                  ($ in millions)
                                     ----------------------------------------
                                      Currently    Not Currently
                                     Exercisable    Exercisable       Total
                                     -----------   -------------     ------
     Subsidiary agencies                $111.6        $102.8         $214.4
     Affiliated agencies                  12.9          14.9           27.8
                                        ------        ------         ------
          Total                         $124.5        $117.7         $242.2
                                        ======        ======         ======

If these  rights  were to be  exercised,  there  would be an increase in our net
income as a result of our increased ownership and the corresponding reduction in
minority interest expense.


                                       12


ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITIONS AND RESULTS
        OF OPERATIONS (Continued)

Liquidity and Capital Resources

     Liquidity:  We had cash and cash  equivalents  totaling  $354.6 million and
$667.0  million and  short-term  investments  totaling  $26.1  million and $28.9
million at March 31, 2003 and December 31, 2002,  respectively.  Consistent with
our  historical  trends in the first  quarter of the year,  we had negative cash
flow from operations of $663.8  million,  including tax payments and payments to
vendors and to the media on behalf of clients.  This  resulted in a  significant
reduction in our year-end current liabilities.  We funded these liabilities with
cash on hand and by drawing down on available credit facilities.

     Capital  Resources:  We maintain two revolving  credit  facilities with two
consortia of banks, a three-year  revolving credit facility which increased from
$800.0  million to $835.0  million and matures  November 14, 2005 and a $1,025.0
million 364-day  revolving  credit facility with a maturity date of November 13,
2003. We are also an active  participant in the  commercial  paper market with a
$1,500.0  million  program.  Each of our bank credit  facilities  provide credit
support for issuances  under this  program.  As of March 31, 2003, we had $450.4
million  borrowings  outstanding  under  these  credit  facilities.  The 364-day
facility includes a provision which allows us to convert all amounts outstanding
at expiration of the facility into a one-year term loan. The consortium of banks
under the 364-day credit  facility  consists of 19 banks for which Citibank N.A.
acts as agent.  Other significant  lending  institutions  include JPMorgan Chase
Bank,  HSBC Bank USA,  San Paolo IMI  S.p.A.,  Barclays,  Wachovia  and  Societe
Generale. A similar consortium of 16 banks provides support under the three-year
revolving credit facility for which Citibank N.A. acts as  administrative  agent
and  ABN  AMRO  Bank  acts  as  syndication  agent.  Other  significant  lending
institutions  include HSBC Bank USA,  JPMorgan Chase Bank,  Wachovia and Societe
Generale.  These  facilities  provide  us with the  ability  to  classify  up to
$1,860.0  million of our borrowings due within one year as long-term debt, as it
is our intention to keep the borrowings outstanding on a long-term basis.

     We had  short-term  bank loans of $95.9  million and $50.4 million at March
31, 2003, and December 31, 2002,  respectively  comprised of domestic borrowings
and bank overdrafts of our international subsidiaries which are unsecured loans.

     At March 31, 2003, we had a total of $1,747.0 million  aggregate  principal
amount of convertible notes  outstanding,  including $847.0 million Liquid Yield
Option Convertible Notes due 2031, which were issued in February 2001 and $900.0
million Zero Coupon Zero Yield  Convertible Notes due 2032, which were issued in
March 2002. The holders of our Liquid Yield Option notes have the right to cause
us to  repurchase  up to the  entire  aggregate  face  amount of the notes  then
outstanding  for par value in  February of each year and the holders of our Zero
Coupon Zero Yield  Convertible Notes have the right to cause us to repurchase up
to the entire  aggregate face amount of the notes then outstanding for par value
in August of each year.  Both  series of notes are  convertible,  at a specified
ratio,  only upon the  occurrence  of certain  events,  including  if our common
shares trade above certain levels, if we effect extraordinary transactions or if
our  long-term  debt ratings are  downgraded  by at least two notches from their
March  31,  2003  level  of A- to BBB or lower by  Standard  & Poor's  Investors
Services,  Inc., and Baa1 to


                                       13


ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITIONS AND RESULTS
        OF OPERATIONS (Continued)

Baa3 or lower by  Moody's  Investors  Services,  Inc.  These  events  would not,
however,  result  in an  adjustment  of  the  number  of  shares  issuable  upon
conversion.  On February 3, 2003,  we offered to pay holders of the Liquid Yield
Option Notes due in 2031, $30 in cash per $1,000  principal  amount of notes. On
February 7, 2003,  we  repurchased  for cash,  $2.9  million of these notes from
holders who  tendered  their  notes in lieu of the cash  payment,  reducing  the
outstanding  aggregate  face amount of the Liquid  Yield  Option Notes to $847.0
million. We paid $25.4 million to qualified noteholders who did not tender their
notes on February 21, 2003.

     At March 31, 2003, we had approximately  $166.4 million of Euro-denominated
bonds outstanding.  The bonds pay a fixed rate of 5.2% to maturity in June 2005.
The bonds serve as a hedge of our  investment  in  Euro-denominated  net assets.
While an increase  in the value of the euro  against the dollar will result in a
greater  liability  for interest and  principal,  there will be a  corresponding
increase in the dollar value of our euro-denominated net assets.

     Below  is a  summary  of our  debt  position  as of  March  31,  2003 ($ in
millions):

     Debt:
         Bank loans (due in less than 1 year)........................   $   95.9
         $835.0 Million Revolver  -  due November 14, 2005...........      100.0
         Commercial paper issued under 364-day Facility..............      350.4
         5.20% Euro notes  -  due June 24, 2005......................      166.4
         Convertible notes  -  due February 7, 2031..................      847.0
         Convertible notes  -  due July 31, 2032.....................      900.0
         Loan notes and sundry  -  various through 2012..............       22.3
                                                                        --------

     Total Debt......................................................   $2,482.0
                                                                        ========

     We believe that our operating  cash flow combined with our available  lines
of credit and our access to the capital  markets are  sufficient  to support our
foreseeable cash requirements,  including working capital, capital expenditures,
dividends and acquisitions.


                                       14


ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Market Risk

     Our  operations  are  subject  to  the  risk  of  currency   exchange  rate
fluctuations related to our international operations. While our agencies conduct
business  in more than 70  different  currencies,  our major  non-U.S.  currency
markets are the European Monetary Union (EMU), the United Kingdom, Japan, Brazil
and  Canada.  Our net  income is  subject  to risk from the  translation  of the
revenue and expenses of our foreign operations,  which are generally denominated
in the local currency. The effects of currency exchange rate fluctuations on our
first quarter operations were positive as discussed above.

     We do not hedge our exposure  against the US dollar in the normal course of
our business.  We do,  however,  conduct global  treasury  operations to improve
liquidity and manage third-party interest expense centrally. As an integral part
of these operations, we enter into short-term forward foreign exchange contracts
to hedge intercompany cash movements between subsidiaries operating in different
currency  markets.  To the extent that our treasury  centers require  liquidity,
they can access local currency lines of credit, our committed bank facilities or
dollar-denominated  commercial  paper. A foreign  treasury center borrowing U.S.
dollar-denominated  commercial  paper will  generally  enter  into a  short-term
exchange contract to hedge its position.

     Outside of major markets, our subsidiaries  generally borrow funds directly
in their local currency.  In addition, we periodically enter into cross-currency
interest rate swaps to hedge our net yen investments.

     Our 2002 Form 10-K provides a more detailed  discussion of the market risks
affecting our operations.  As of March 31, 2003, no material change had occurred
in our market risks from the disclosure contained in that 10-K.

Forward-Looking Statements

     "Management's Discussion and Analysis of Financial Condition and Results of
Operations" and "Quantitative and Qualitative Disclosures About Market Risk" set
forth in this report contain  disclosures which are  forward-looking  statements
within the meaning of the federal  securities laws.  Forward-looking  statements
include all statements that do not relate solely to historical or current facts,
and can be  identified  by the use of words  such as  "may,"  "will,"  "expect,"
"project,"  "estimate,"  "anticipate,"  "envisage,"  "plan" or "continue." These
forward-looking  statements are based upon our current plans or expectations and
are  subject to a number of  uncertainties  and risks  that could  significantly
affect current plans and anticipated  actions and our future financial condition
and  results.  The  uncertainties  and risks  include,  but are not  limited to,
changes  in   general   economic   conditions,   competitive   factors,   client
communication  requirements,  the hiring and  retention of human  resources  and
other factors. In addition, our international operations are subject to the risk
of currency  fluctuations,  exchange controls and similar risks discussed above.
As a  consequence,  current  plans,  anticipated  actions  and future  financial
condition  and results may differ from those  expressed  in any  forward-looking
statements made by us or on our behalf, and those differences could be material.


                                       15


ITEM 4. CONTROLS AND PROCEDURES

     We maintain  disclosure  controls  and  procedures  designed to ensure that
information required to be included in our SEC reports is recorded, analyzed and
reported within  applicable time periods.  During the 90-day period prior to the
filing of this report,  we conducted an evaluation,  under the  supervision  and
with the  participation  of our  management,  including  our CEO and CFO, of the
effectiveness  of  our  disclosure  controls  and  procedures.   Based  on  that
evaluation,  our CEO and CFO  concluded  that they believe  that our  disclosure
controls  and  procedures  are  effective  to  ensure  recording,  analysis  and
reporting of information  required to be included in our SEC reports on a timely
basis. There have been no significant  changes in our internal controls or other
factors  that  could  be  reasonably   expected  to  significantly   affect  the
effectiveness of these controls since that evaluation was completed.


                                       16


PART II. OTHER INFORMATION

Item 6. Exhibit and Reports on Form 8-K

(a) Exhibits

      99.1  Certification  pursuant  to 18  U.S.C. ss.1350, as adopted  pursuant
            to ss.906 of the Sarbanes-Oxley Act of 2002.

(b) Reports on Form 8-K

      On February  25,  2003,  we filed a Current  Report on Form 8-K to furnish
      under Item 9 (Regulation FD Disclosure)  our press release  announcing our
      operating  results for 2002 and the fourth quarter of 2002 and the text of
      materials used in the related call at which such results were discussed.


                                       17


                                   SIGNATURES

      Pursuant to the  requirements of the Securities  Exchange Act of 1934, the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned thereunto duly authorized.

                                         OMNICOM GROUP INC.



May 15, 2003                             /s/ Randall J. Weisenburger
                                         ---------------------------------------
                                            Randall J. Weisenburger
                                            Executive Vice President
                                            and Chief Financial Officer
                                            (on behalf of Omnicom Group Inc.
                                            and as Principal Financial Officer)


                                       18


                                  CERTIFICATION

I, John Wren, certify that:

      1. I have  reviewed  this  quarterly  report on Form 10-Q of Omnicom Group
Inc.;

      2. Based on my  knowledge,  this  quarterly  report  does not  contain any
untrue  statement of a material fact or omit to state a material fact  necessary
in order to make the statements made, in light of the circumstances  under which
such  statements were made, not misleading with respect to the period covered by
this quarterly report;

      3. Based on my knowledge,  the financial  statements,  and other financial
information  included in this quarterly  report,  fairly present in all material
respects the financial  condition,  results of operations  and cash flows of the
registrant as of, and for, the periods presented in this quarterly report;

      4. The  registrant's  other  certifying  officer and I are responsible for
establishing and maintaining  disclosure  controls and procedures (as defined in
Exchange Act Rules 13a-14 and 15d-14) for the registrant and we have:

            a) designed such  disclosure  controls and procedures to ensure that
      material   information   relating  to  the   registrant,   including   its
      consolidated  subsidiaries,  is made  known to us by others  within  those
      entities, particularly during the period in which this quarterly report is
      being prepared;

            b)  evaluated  the  effectiveness  of  the  registrant's  disclosure
      controls  and  procedures  as of a date within 90 days prior to the filing
      date of this quarterly report (the "Evaluation Date"); and

            c)  presented in this  quarterly  report our  conclusions  about the
      effectiveness  of the  disclosure  controls  and  procedures  based on our
      evaluation as of the Evaluation Date;

      5. The registrant's other certifying  officer and I have disclosed,  based
on our most  recent  evaluation,  to the  registrant's  auditors  and the  audit
committee  of  registrant's  board  of  directors  (or  persons  performing  the
equivalent function):

            a) all  significant  deficiencies  in the  design  or  operation  of
      internal controls which could adversely affect the registrant's ability to
      record,  process,  summarize and report financial data and have identified
      for  the  registrant's   auditors  any  material  weaknesses  in  internal
      controls; and

            b) any fraud,  whether or not material,  that involves management or
      other employees who have a significant role in the  registrant's  internal
      controls; and

      6. The registrant's  other certifying officer and I have indicated in this
quarterly  report  whether or not there  were  significant  changes in  internal
controls or in other factors that could  significantly  affect internal controls
subsequent to the date of our most recent  evaluation,  including any corrective
actions with regard to significant deficiencies and material weaknesses.


Date:    May 15, 2003                  /s/ John D. Wren
                                       -----------------------------------------
                                                      John D. Wren
                                         Chief Executive Officer and President


                                       19


                                  CERTIFICATION

I, Randall Weisenburger, certify that:

      1. I have  reviewed  this  quarterly  report on Form 10-Q of Omnicom Group
Inc.;

      2. Based on my  knowledge,  this  quarterly  report  does not  contain any
untrue  statement of a material fact or omit to state a material fact  necessary
in order to make the statements made, in light of the circumstances  under which
such  statements were made, not misleading with respect to the period covered by
this quarterly report;

      3. Based on my knowledge,  the financial  statements,  and other financial
information  included in this quarterly  report,  fairly present in all material
respects the financial  condition,  results of operations  and cash flows of the
registrant as of, and for, the periods presented in this quarterly report;

      4. The  registrant's  other  certifying  officer and I are responsible for
establishing and maintaining  disclosure  controls and procedures (as defined in
Exchange Act Rules 13a-14 and 15d-14) for the registrant and we have:

            a) designed such  disclosure  controls and procedures to ensure that
      material   information   relating  to  the   registrant,   including   its
      consolidated  subsidiaries,  is made  known to us by others  within  those
      entities, particularly during the period in which this quarterly report is
      being prepared;

            b)  evaluated  the  effectiveness  of  the  registrant's  disclosure
      controls  and  procedures  as of a date within 90 days prior to the filing
      date of this quarterly report (the "Evaluation Date"); and

            c)  presented in this  quarterly  report our  conclusions  about the
      effectiveness  of the  disclosure  controls  and  procedures  based on our
      evaluation as of the Evaluation Date;

      5. The registrant's other certifying  officer and I have disclosed,  based
on our most  recent  evaluation,  to the  registrant's  auditors  and the  audit
committee  of  registrant's  board  of  directors  (or  persons  performing  the
equivalent function):

            a) all  significant  deficiencies  in the  design  or  operation  of
      internal controls which could adversely affect the registrant's ability to
      record,  process,  summarize and report financial data and have identified
      for  the  registrant's   auditors  any  material  weaknesses  in  internal
      controls; and

            b) any fraud,  whether or not material,  that involves management or
      other employees who have a significant role in the  registrant's  internal
      controls; and

      6. The registrant's  other certifying officer and I have indicated in this
quarterly  report  whether or not there  were  significant  changes in  internal
controls or in other factors that could  significantly  affect internal controls
subsequent to the date of our most recent  evaluation,  including any corrective
actions with regard to significant deficiencies and material weaknesses.


Date:    May 15, 2003                    /s/ Randall J. Weisenburger
                                         ---------------------------------------
                                                   Randall J. Weisenburger
                                                Executive Vice President and
                                                   Chief Financial Officer


                                       20