Robin Williams
T.S. Garp
Mary Beth Hurt
Helen Holm
Glenn Close
Jenny Fields
John Lithgow
Roberta Muldoon
Hume Cronyn
Mr. Fields
Jessica Tandy
Mrs. Fields
Swoosie Kurtz
The Hooker
Brenda Currin
Pooh
Peter Michael Goetz
John Wolfe
Jenny Wright
Cushie
John Irving
Referee
Amanda Plummer
Ellen James
Bette Henritze
Woman Candidate
Katherine Borowitz
Rachel
Kate McGregor-Stewart
Real Estate Lady
Mark Soper
Michael Milton
Warren Berlinger
Stew Percy
Brandon Maggart
Ernie Holm
Victor Magnotta
First Coach
Al Cerullo
Helicopter Pilot
Ron Frazier
Stephen
Eve Gordon
Marge Tallworth
George Roy Hill
Pilot (uncredited)