 | Dustin Hoffman als Ted Kramer |
 | Meryl Streep als Joanna Kramer |
 | Jane Alexander als Margaret Phelps |
 | Justin Henry als Billy Kramer |
 | Howard Duff als John Shaunessy |
 | George Coe als Jim O'Connor |
 | JoBeth Williams als Phyllis Bernard |
 | Bill Moor als Gressen |
 | Howland Chamberlain als Judge Atkins |
| Jack Ramage als Spencer |
| Jess Osuna als Ackerman |
| Nicholas Hormann als Interviewer |
| Ellen Parker als Teacher |
| Shelby Brammer als Ted's Secretary |
| Carol Nadell als Mrs. Kline |
| Donald Gantry als Surgeon |
 | Joe Seneca als Partygoer |
| David Golden als Grocer |
 | Sean Albertson als Boy in Hospital (uncredited) |
| Iris Klein als Partygoer (as Iris Alhanti) |
| Lori Randolph als Blonde Little Girl at park (uncredited) |
| Stanley R. Jaffe | Producer |
| Robert Benton | Screenplay |
| Robert Benton | Director |
| Néstor Almendros | Director of Photography |
| Gerald B. Greenberg | Editor |
| Avery Corman | Novel |
| Shirley Rich | Casting |
| Renata Stoia | Script Supervisor |
| Paul Sylbert | Production Design |
| Alan Hicks | Set Decoration |
| Allen Weisinger | Makeup Artist |
| Joseph Coscia | Hairstylist |
| Holly Bower | Still Photographer |
| Arthur Bloom | Boom Operator |
| Ruth Morley | Costume Design |
| Edward Garzero | Scenic Artist |
| Bill Pankow | Assistant Editor |
| Brooke Kennedy | Location Manager |
| David Golden | Production Manager |
| Jerry DeBlau | Best Boy Electric |
| Richard Fischoff | Associate Producer |
| Merle Eckert | Construction Coordinator |
| Erma E. Levin | Music Editor |
| Thomas Saccio | Property Master |
| Kenneth Goss | Key Grip |
| Jack C. Jacobsen | Sound Mixer |
| Al Craine | Costumer |
| Stan Bochner | Sound Editor |
| Sanford Rackow | Supervising Sound Editor |
| Ann Guerin | Unit Publicist |
| Tom Priestley Jr. | Camera Operator |
| Vinnie Gerardo | First Assistant Camera |
| James Perdue | Sound Recordist |
| Thomas John Kane | First Assistant Director |
| Yudi Bennett | Second Assistant Director |
| Marilyn Putnam | Costumer |
| Marion Billings | Publicist |
