Prospectus Supplement filed under Rule 424(b)(3)
                                                      Registration No. 333-84573

                              Prospectus Supplement
                             Dated October 13, 2000

     The Prospectus dated August 13, 1999 relating to the offer for resale of up
to $361,000,000 aggregate principal amount of The Interpublic Group of
Companies, Inc.'s 1.87% Convertible Subordinated Notes due 2006, and such shares
of common stock as may be issued upon conversion of the notes, is hereby
supplemented to include the following information in the "Selling
Securityholders" table in the Prospectus Supplement dated August 13, 1999:


     The "Selling Securityholders" table in the Prospectus, as supplemented, is
amended so that the principal amount of registered notes held by Van Kampen
Harbor Fund(1) is increased from $2,530,000 to $3,000,000.

     The "Selling Securityholders" table in the Prospectus, as supplemented, is
amended so that the principal amount of registered notes held by Van Kampen
Convertible Securities Fund(1) is decreased from $470,000 to $0.


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1    Morgan Stanley & Co. Incorporated, an affiliate of Van Kampen Harbor Fund
     and Van Kampen Convertible Securities Fund, was an initial purchaser of the
     1.87% Convertible Subordinated Notes due 2006, when the notes were
     originally sold in a private placement