 | Warren Beatty als Vincent Bruce |
 | Jean Seberg als Lilith Arthur |
 | Peter Fonda als Stephen Evshevsky |
 | Kim Hunter als Dr. Bea Brice |
 | Anne Meacham als Mrs. Yvonne Meaghan |
 | Jessica Walter als Laura |
 | Gene Hackman als Norman |
 | James Patterson als Dr. Lavrier |
 | Robert Reilly als Bob Clayfield |
 | René Auberjonois als Howie (uncredited) |
| Jeanne Barr als Miss Glassman (uncredited) |
| Maurice Brenner als Mr. Gordon (uncredited) |
 | Ben Carruthers als Benito (uncredited) |
 | Olympia Dukakis als Patient (uncredited) |
 | Edith Fellows als Patient (uncredited) |
 | Alice Spivak als Lonely Girl (uncredited) |
| Tina Pine als Patient (uncredited) |
| Robert Rossen | Director |
| Kenyon Hopkins | Original Music Composer |
| Robert Rossen | Producer |
| Eugen Schüfftan | Director of Photography |
| Aram Avakian | Editor |
| Richard Sylbert | Production Design |
| Gene Callahan | Set Decoration |
| Hugh A. Robertson | Associate Editor |
| Ruth Morley | Costume Designer |
| Robert Rossen | Screenplay |
| J. R. Salamanca | Novel |
| Robert Q. Lovett | Associate Editor |
| Edward Beyer | Sound Editor |
| Barry Malkin | Assistant Editor |
| Lynn Ratener | Assistant Editor |
| Elinor Bunin | Title Designer |
| Jim Di Gangi | Production Manager |
| Eleanor Wolquitt | Producer's Assistant |
| Larry Sturhahn | Assistant Director |
| Bob Vietro | Assistant Director |
| Allan Dennis | Second Assistant Director |
| Dorothy Weshner | Script Supervisor |
| Joe Coffey | Camera Operator |
| Bert Siegel | Assistant Camera |
| Tibor Sands | Assistant Camera |
| Jim Shields | Sound |
| Richard Vorisek | Sound |
| Frederick Jones | Hairstylist |
| Irving Buchman | Makeup Artist |
| Bill Herman | Makeup Artist |
| Robert Jiras | Makeup Artist |
| Flo Transfield | Wardrobe Supervisor |
| George Newman | Wardrobe Supervisor |
| Josh Weiner | Still Photographer |
| Kenyon Hopkins | Conductor |
