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)