 | Anthony Franciosa als Peter Neal |
 | John Saxon als Bullmer |
 | Daria Nicolodi als Anne |
 | Giuliano Gemma als Detective Germani |
 | Christian Borromeo als Gianni |
 | Mirella D'Angelo als Tilde |
 | Veronica Lario als Jane McKerrow |
 | Ania Pieroni als Elsa Manni |
 | Eva Robin's als Girl on Beach |
 | Carola Stagnaro als Detective Altieri |
 | John Steiner als Christiano Berti |
 | Lara Wendel als Maria Alboretto |
 | Isabella Amadeo als Bullmer's secretary |
 | Mirella Banti als Marion |
 | Ennio Girolami als Department Store Manager (as Enio Girolami) |
| Monica Maisani |
 | Marino Masé als John |
 | Fulvio Mingozzi als Alboretto, the porter |
 | Giampaolo Saccarola als Coroner (as Gianpaolo Saccarola) |
| Ippolita Santarelli als Prostitute |
 | Francesca Viscardi |
 | Dario Argento als Narrator (Italian version) / Murderer's Hands (voice) (uncredited) |
 | Lamberto Bava als Elevator Repairman #1 (uncredited) |
 | Michele Soavi als Maria's Boyfriend / Man Walking with Girl on Beach (uncredited) |
| Saverio Mangogna | Production Secretary |
| Enrico Lucherini | Unit Publicist |
| Carlo Du Bois | Production Accountant |
| Diego Della Valle | Shoe Design |
| Ferdinando Caputo | Production Accountant |
| Francesca Roberti | Script Supervisor |
| David Block | Colorist |
| Roberto Priori | Assistant Editor |
| Piero Bozza | Assistant Editor |
| Vanda Caprioli | Other |
| Barbara Canevari | Assistant Costume Designer |
| Giuseppe Tinelli | Camera Operator |
| Maurizio Piano | Assistant Camera |
| Mario Moreschini | Key Grip |
| Roberto Marsigli | Assistant Camera |
| Francesco Giulivi | Gaffer |
| Remo Cartocci | Grip |
| Francesco Bellomo | Still Photographer |
| Giovanni Corridori | Special Effects |
| Romano Pampaloni | Sound Mixer |
| Giancarlo Laurenzi | Boom Operator |
| Mario Dallimonti | Sound |
| Massimo Anzellotti | Sound Effects |
| Luciano Anzellotti | Sound Effects |
| Aldo Taloni | Set Dresser |
| Cesare Piccini | Assistant Property Master |
| Giuseppe Pagnotta | Property Master |
| Osvaldo Monaco | Property Master |
| Massimo Garrone | Assistant Set Decoration |
| Antonella Caputo | Assistant Production Design |
| Michele Soavi | Second Assistant Director |
| Lamberto Bava | First Assistant Director |
| Giuseppe Mangogna | Production Manager |
| Cesare Jacolucci | Production Manager |
| Cesare Jacolucci | Production Supervisor |
| Pierantonio Mecacci | Makeup Artist |
| Patrizia Corridoni | Key Hair Stylist |
| Franco Tomei | Costume Designer |
| Pierangelo Cicoletti | Costume Designer |
| Maurizio Garrone | Set Decoration |
| Tommaso Barbi | Set Decoration |
| Franco Fraticelli | Editor |
| Luciano Tovoli | Director of Photography |
| Claudio Simonetti | Original Music Composer |
| Fabio Pignatelli | Original Music Composer |
| Massimo Morante | Original Music Composer |
| Salvatore Argento | Executive Producer |
| Claudio Argento | Producer |
| Dario Argento | Story |
| Dario Argento | Screenplay |
| Dario Argento | Director |
| Giuseppe Bassan | Production Design |
