• 
  George Roy Hill

  regizor

• 
  Steve Tesich

  scenarist

• 
  Robin Williams

  Garp
• 
  Glenn Close

  Jenny Fields
• 
  Mary Beth Hurt

  Helen Holm
• 
  John Lithgow

  Roberta Muldoon
• 
  Victor Magnotta

  First Coach - Steering School
• 
  Kaiulani Lee

  Chief Ellen Jamesian - Dog's Head Mansion

• 
  Christopher Steele

  Bosworth - Steering School
• 
  Swoosie Kurtz

  The Hooker
• 
  Jenny Wright

  Cushie - Steering School
• 
  John Irving (I)

  Referee - Steering School
• 
  Jessica Tandy

  Mrs. Fields
• 
  Matthew Cowles

  Speeding Plumber - Garp's Town
• 
  Amanda Plummer

  Ellen James - New York

• 
  Eve Gordon

  Marge Tallworth - Garp's Town
• 
  George Roy Hill

  Pilot
• 
  Jean De Baer

  Woman speaker - New York
• 
  Tim Gallin

  Fireman - New York
• 
  Hume Cronyn

  Mr. Fields
• 
  Peter Michael Goetz

  John Wolfe
• 
  Harris Laskaway

  Randy - Dog's Head Mansion
• 
  Katherine Borowitz

  Rachel - New York
• 
  Warren Berlinger

  Stew Percy - Steering School
• 
  Brandon Maggart

  Ernie Holm - Steering School
• 
  Garett Maggart

  Kid
• 
  Al Cerullo

  Helicopter Pilot - Steering School
• 
  Nathan Babcock

  Duncan
• 
  Susan Browning

  Midge Percy
• 
  George Ede

  Dean Bodger
• 
  Ian MacGregor

  Walt
• 
  James McCall

  Young Garp
• 
  Mark Soper

  Michael Milton