Dustin Hoffman (Ted Kramer), Meryl Streep (Joanna Kramer), Jane Alexander (Margaret Phelps), Justin Henry (Billy Kramer), Howard Duff (John Shaunessy), George Coe (Jim O'Connor), JoBeth Williams (Phyllis Bernard) more..., Bill Moor (Gressen), Howland Chamberlain (Judge Atkins), Jack Ramage (Spencer), Jess Osuna (Ackerman), Nicholas Hormann (Interviewer), Ellen Parker (Teacher), Shelby Brammer (Ted's Secretary), Carol Nadell (Mrs. Kline), Donald Gantry (Surgeon), Joe Seneca (Partygoer), David Golden (Grocer), Sean Albertson (Boy in Hospital (uncredited))

Robert Benton (Screenplay), Avery Corman (Novel), Stanley R. Jaffe (Producer), Néstor Almendros (Director of Photography), Gerald B. Greenberg (Editor), Shirley Rich (Casting), Richard Fischoff (Associate Producer) more..., David Golden (Production Manager), Paul Sylbert (Production Design), Alan Hicks (Set Decoration), Ruth Morley (Costume Design), Joseph Coscia (Hairstylist), Allen Weisinger (Makeup Artist), Merle Eckert (Construction Coordinator), Edward Garzero (Scenic Artist), Bill Pankow (Assistant Editor), Brooke Kennedy (Location Manager), Erma E. Levin (Music Editor), Renata Stoia (Script Supervisor), Holly Bower (Still Photographer), Jerry DeBlau (Best Boy Electric), Arthur Bloom (Boom Operator), Thomas Saccio (Property Master), Thomas John Kane (First Assistant Director), Yudi Bennett (Second Assistant Director), Marilyn Putnam (Costumer), Al Craine (Costumer), Marion Billings (Publicist), Ann Guerin (Unit Publicist), Kenneth Goss (Key Grip), Tom Priestley Jr. (Camera Operator), Vinnie Gerardo (First Assistant Camera), Stan Bochner (Sound Editor), Jack C. Jacobsen (Sound Mixer), Sanford Rackow (Supervising Sound Editor), James Perdue (Sound Recordist),