| Person | Type | Job | Role(s) |
|---|---|---|---|
 Augie Lohman | Crew | Crew | Special Effects |
 Buck Henry | Crew | Writing | Screenplay |
 Christian Marquand | Crew | Directing | Director |
 Dave Grusin | Crew | Sound | Original Music Composer |
 Dean Tavoularis | Crew | Art | Art Direction |
 Douglas Trumbull | Crew | Visual Effects | Visual Effects |
Elda Magnanti | Crew | Costume & Make-Up | Hairstylist |
Enrico Sabbatini | Crew | Costume & Make-Up | Costume Design |
George R. Nelson | Crew | Art | Set Decoration |
Giancarlo Cappelli | Crew | Editing | Editor |
 Giuseppe Rotunno | Crew | Camera | Director of Photography |
Harold E. Wellman | Crew | Visual Effects | Visual Effects |
Mason Hoffenberg | Crew | Writing | Novel |
Selig J. Seligman | Crew | Production | Executive Producer |
 Terry Southern | Crew | Writing | Novel |
Giuliano Laurenti | Crew | Costume & Make-Up | Makeup Artist |
Robert Haggiag | Crew | Production | Producer |
Peter Zoref | Crew | Production | Executive Producer |
 Anita Pallenberg | Cast | Actress | Nurse Bullock |
Anthony Foutz | Cast | Actor | Mobster |
Buck Henry | Cast | Actor | Mental Patient (uncredited) |
 Charles Aznavour | Cast | Actor | Hunchback juggler |
Christian Marquand | Cast | Actor | Film Director (uncredited) |
 Elsa Martinelli | Cast | Actress | Livia |
 Enrico Maria Salerno | Cast | Actor | Jonathan J. John |
 Enzo Fiermonte | Cast | Actor | Al Pappone |
 Ewa Aulin | Cast | Actress | Candy Christian |
 Florinda Bolkan | Cast | Actress | Lolita |
 James Coburn | Cast | Actor | Dr. A.B. Krankheit |
 Joey Forman | Cast | Actor | The Cop |
 John Astin | Cast | Actor | T.M. Christian / Jack Christian |
 John Huston | Cast | Actor | Dr. Arnold Dunlap |
 Judith Malina | Cast | Actress | Woman (uncredited) |
 Julian Beck | Cast | Actor | Hippie (uncredited) |
 Lea Padovani | Cast | Actress | Silvia Fontegliulo |
 Marilù Tolo | Cast | Actress | Marquita |
 Marlon Brando | Cast | Actor | Grindl |
 Micaela Pignatelli | Cast | Actress | Girl |
Peter Dane | Cast | Actor | Luther |
 Richard Burton | Cast | Actor | MacPhisto |
 Ringo Starr | Cast | Actor | Emmanuel |
 Umberto Orsini | Cast | Actor | The Big Guy |
 Walter Matthau | Cast | Actor | Gen. R.A. Smight |
 Sugar Ray Robinson | Cast | Actor | Zero |
Fabian Dean | Cast | The Sergeant | |
Neal Noorlag | Cast | Harold | |
Peggy Nathan | Cast | Miss Quinby | |
Mark Salvage | Cast | Actor | Dr. Harris |
Tom Keyes | Cast | Mobster | |
| Person | Type | Job | Role(s) |
