 | Maria Schneider als Michelle |
 | Sydne Rome als Ann |
 | Vic Morrow als Vic |
 | Robert Vaughn als Stuart Chase |
 | John Whittington als "Boots" Peter Franklin |
 | Nadja Tiller als Lotte |
 | Carl Möhner als Cyrus Franklin |
 | Clelia Matania als Old Neighbour |
 | Marco Tulli als Commissaire Trieste |
 | Armando Brancia als Inspector Carrara |
 | Georg Marischka als Henderson |
 | Renato Pozzetto als Gianni |
 | Maria Cumani Quasimodo als Princess Ruspini (uncredited) |
 | Margherita Horowitz als Maid (uncredited) |
| Mark Peploe | Screenplay |
| Nicola Badalucco | Screenplay |
| René Clément | Director |
| Carlo Ponti | Producer |
| Luciano Vincenzoni | Screenplay |
| Alberto Spagnoli | Director of Photography |
| René Clément | Screenplay |
| Nicola Badalucco | Story |
| Luciano Vincenzoni | Story |
| Francis Lai | Original Music Composer |
| Wolfdieter von Stein | Producer |
| Zev Braun | Producer |
| Jacques Bar | Executive Producer |
| Jacques Bar | Producer |
| Christiane Lack | Editor |
| Fedora Zincone | Editor |
| Carlo Egidi | Art Direction |
| Carlo Gervasi | Set Decoration |
| Nadia Vitali | Costume Design |
| Otello Fava | Makeup Artist |
| Luciano Vito | Hairstylist |
| Luciano Piperno | Production Supervisor |
| Carlo Palmieri | Sound |
| Marco Pettini | Assistant Director |
| Antonio Gabrielli | Assistant Director |
| Carlo De Marchis | Special Effects Assistant |
| Carlo Rambaldi | Special Effects Supervisor |
| Vic Morrow | Stunts |
| Giovanni Fiore Coltellacci | Assistant Camera |
| Emilio Loffredo | Camera Operator |
| Jose Villaverde | Casting |
| Catherine Zins | Assistant Editor |
| Anita Borgiotti | Script Supervisor |
| André Ceccarelli | Musician |
| Christian Gaubert | Musician |
| Christian Gaubert | Conductor |
| Raymond Jimenez | Musician |
| Jannick Top | Musician |
| Sergio Bologna | Administration |
| Luciano Piperno | General Manager |
