 | Marcello Mastroianni als Bruno Baldassarre |
 | Agostina Belli als Teresa Colasanti |
 | Ursula Andress als Princess Anna Dell'Orso |
 | Peter Ustinov als Harry Hellman |
 | Jean-Claude Brialy als Van Nijlen |
 | Mario Scaccia als Marino Cianciarelli |
 | Gianfranco Barra als Cantalamessa |
 | Giuseppe Anatrelli als Carru |
 | Serge Frédéric als Melzio |
| Jean-Patrick Junoy als Alex |
 | Luigi Zerbinati als The 'Debosciato', nephew of Prince Dell'Orso |
| Angelo Monte |
| Massimiliano Monti |
| Francesco Infantino |
 | Antonio Spinnato |
 | Catharina Dahlin als Edith (as Caterina Dalin) |
| Angelo Piazza |
| Paola Orefice |
 | Nando Paone als Conductor |
 | Jimmy il Fenomeno als Protester (uncredited) |
| Steno | Director |
| Roberto Infascelli | Producer |
| Ugo Moretti | Novel |
| Agenore Incrocci | Screenplay |
| Furio Scarpelli | Screenplay |
| Steno | Screenplay |
| James Bryan | Editor |
| Antonio Siciliano | Editor |
| Mario Ambrosino | Art Direction |
| Arrigo Breschi | Set Decoration |
| Giuseppe Banchelli | Makeup Artist |
| Franco Corridoni | Makeup Artist |
| Franco Schioppa | Makeup Artist |
| Gilda De Guilmi | Hairstylist |
| Hermes Gallippi | Production Supervisor |
| Paolo Infascelli | Unit Manager |
| Egidio Valentini | Production Manager |
| Louis Pitzele | Second Assistant Director |
| Adriano Tiberi | Props |
| Luciano Anzellotti | Sound Recordist |
| Massimo Anzellotti | Sound Effects Editor |
| Romano Checcacci | Sound Mixer |
| Maurizio Merli | Boom Operator |
| Giorgio Pallotta | Sound |
| Antonio Annunziata | Assistant Camera |
| Sergio Coletta | Gaffer |
| Sergio Emidi | Key Grip |
| Ubaldo Terzano | Camera Operator |
| Giovanni Vino | Still Photographer |
| Luca Sabatelli | Costumer |
| Nadia Vitali | Costume Assistant |
| Luigi Gorini | Assistant Editor |
| Anna Rosa Napoli | Assistant Editor |
| Riz Ortolani | Conductor |
| Paolo Vasile | Production Secretary |
| Vivalda Vigorelli | Script Supervisor |
| Riz Ortolani | Original Music Composer |
| Luigi Kuveiller | Cinematography |
| Mario Ambrosino | Production Designer |
| Mario Ambrosino | Costume Designer |
| Lodovico Gasparini | First Assistant Director |
| Mauro Passi | Assistant Set Decoration |
