| Person | Type | Job | Role(s) |
|---|---|---|---|
 Angelo Iacono | Crew | Production | Production Manager |
 Bruno Nicolai | Crew | Sound | Conductor |
 Bryan Edgar Wallace | Crew | Writing | Screenplay |
 Carlo Leva | Crew | Art | Production Design, Costume Design |
 Dardano Sacchetti | Crew | Writing | Story |
 Dario Argento | Crew | Writing | Screenplay, Director, Story |
 Ennio Morricone | Crew | Sound | Original Music Composer |
Erico Menczer | Crew | Camera | Director of Photography |
 Franco Fraticelli | Crew | Editing | Editor |
Giuseppe Ferranti | Crew | Costume & Make-Up | Makeup Artist |
Giuseppe Mangogna | Crew | Production | Production Manager |
Luca Sabatelli | Crew | Costume & Make-Up | Costume Design |
Luciano Vittori | Crew | Art | Title Designer, Visual Effects |
 Luigi Cozzi | Crew | Writing | Story |
Mario Ronchetti | Crew | Sound | Sound |
Massimo Anzellotti | Crew | Sound | Sound Effects Editor |
Pierantonio Mecacci | Crew | Costume & Make-Up | Makeup Artist |
Romeo Costantini | Crew | Art | Assistant Set Decoration |
Salvatore Argento | Crew | Production | Producer |
Carlo Vinciguerra | Crew | Lighting | Electrician |
Luciano Anzellotti | Crew | Sound | Sound Effects |
Romano Pampaloni | Crew | Sound | Sound Recordist |
Roberto Pariante | Crew | Directing | Assistant Director |
Maura Turchi | Crew | Costume & Make-Up | Hairstylist |
Sergio Fraticelli | Crew | Editing | Assistant Editor |
Roberto Brega | Crew | Camera | Camera Operator |
Cesarina Casini | Crew | Editing | First Assistant Editor |
Rodolfo Flibotti | Crew | Lighting | Gaffer |
Francesco Rachini | Crew | Lighting | Electrician |
Eugenio Fiori | Crew | Sound | Boom Operator |
Giuseppe Gabrielli | Crew | Camera | Grip |
Renato Mascagno | Crew | Camera | First Assistant Camera |
Firmino Palmieri | Crew | Camera | Still Photographer |
Carlo Du Bois | Crew | Production | Administration, Production Accountant |
Maurizio La Monica | Crew | Camera | Second Assistant Camera |
Ettore Migalizzi | Crew | Camera | Grip |
Alberico Loreti | Crew | Lighting | Best Boy Electric |
Arturo de Castelterlango | Crew | Camera | First Assistant Camera |
Franco Pedacchia | Crew | Art | Assistant Production Design |
Lamberto Verdenelli | Crew | Art | Property Master |
Vincenzo Marchetti | Crew | Costume & Make-Up | Assistant Makeup Artist |
Giovanni Migalizzi | Crew | Camera | Grip |
Roberta Leoni | Crew | Production | Production Secretary |
Roberto Bertozzi | Crew | Lighting | Electrician |
Maurizio Migalizzi | Crew | Camera | Key Grip |
 Ada Pometti | Cast | Actress | Telephone operator |
 Aldo Reggiani | Cast | Actor | Dr. Casoni |
 Aristide Caporale | Cast | Actor | Smoker in the Billiard Hall (uncredited) |
 Carlo Alighiero | Cast | Actor | Dr. Calabresi |
 Catherine Spaak | Cast | Actress | Anna Terzi |
 Cinzia De Carolis | Cast | Actress | Lori |
 Corrado Olmi | Cast | Actor | Morsella |
Emilio Marchesini | Cast | Dr. Mombelli | |
 Franco Ukmar | Cast | Actor | Policeman - Speaks with Morsella About Food (uncredited) |
 Fulvio Mingozzi | Cast | Actor | Spimi's man |
 Gennarino Pappagalli | Cast | Actor | Man in the Terzi's Institute (uncredited) |
 Giovanni Di Benedetto | Cast | Actor | Chief of Police Salmi (uncredited) |
 Giuseppe Marrocco | Cast | Actor | Man at Table in the Saint Peter's Club (uncredited) |
 Horst Frank | Cast | Actor | Dr. Braun |
 James Franciscus | Cast | Actor | Carlo Giordani |
 Karl Malden | Cast | Actor | Franco Arnò |
 Margherita Horowitz | Cast | Actress | Lori's Babysitter (uncredited) |
 Marie Louise Sinclair | Cast | Actress | Film starlet |
 Pier Paolo Capponi | Cast | Actor | Police Supt. Spini |
 Pino Patti | Cast | Actor | Barber |
 Rada Rassimov | Cast | Actress | Bianca Merusi |
Sascha Helwin | Cast | ||
 Stefano Oppedisano | Cast | Actor | Taxi driver |
 Tino Carraro | Cast | Actor | Prof. Fulvio Terzi |
 Tom Felleghy | Cast | Actor | Dr. Esson |
 Ugo Fangareggi | Cast | Actor | Gigi the Loser |
 Umberto Raho | Cast | Actor | Manuel's ex-lover |
 Vittorio Congia | Cast | Actor | Righetto (cameraman) |
 Werner Pochath | Cast | Actor | Manuel |
 Jacques Stany | Cast | Actor | Prof. Manera |
Ettore Arena | Cast | Actor | Billiard Player (uncredited) |
Martial Boschero | Cast | ||
Walter Pinelli | Cast | ||
Aldo Parenti | Cast | (uncredited) | |
| Person | Type | Job | Role(s) |
