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William Holden as Richard Benson |
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Audrey Hepburn as Gabrielle Simpson |
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Grégoire Aslan as Inspector Gilet |
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Raymond Bussières as François |
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Christian Duvaleix as Maitre d'Hotel |
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Michel Thomass as Gangster (as Thomas Michel) |
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Dominique Boschero as Girl at Pool |
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Evi Marandi as Girt at Pool |
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Noël Coward as Alexander Meyerheim |
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Tony Curtis as Actor Portraying Maurice or Philippe (uncredited) |
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Marlene Dietrich as Marlene Dietrich (uncredited) |
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Mel Ferrer as Dr. Jekyll & Mr. Hyde (uncredited) |
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Henri Garcin as Policeman (uncredited) |
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Orestes Ganakis as Philippe (uncredited) |
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Dominique Zardi as Sailor in Café (uncredited) |
| Directing | Richard Quine | Director |
| Writing | George Axelrod | Screenplay |
| Camera | Charles Lang | Director of Photography |
| Art | Jean d'Eaubonne | Art Direction |
| Costume & Make-Up | Hubert de Givenchy | Costume Design |
| Writing | Alan Bergman | Lyricist |
| Sound | Fred Astaire | Vocals |
| Sound | ფრენკ სინატრა | Vocals |
| Production | Richard Quine | Producer |
| Production | George Axelrod | Producer |
| Art | Gabriel Béchir | Set Decoration |
| Costume & Make-Up | Jean Zay | Wardrobe Supervisor |
| Costume & Make-Up | Dean Cole | Hairstylist |
| Costume & Make-Up | Frank McCoy | Makeup Artist |
| Editing | Archie Marshek | Editor |
| Directing | Paul Feyder | Assistant Director |
| Sound | Arthur Morton | Orchestrator |
| Camera | Henri Tiquet | Camera Operator |
| Crew | Paul K. Lerpae | Special Effects |
| Sound | Charles Grenzbach | Sound Recordist |
| Sound | Joseph de Bretagne | Sound Recordist |
| Sound | Lew Spence | Songs |
| Production | Carter DeHaven Jr. | Associate Producer |
| Production | John R. Coonan | Associate Producer |
| Sound | Nelson Riddle | Original Music Composer |
| Visual Effects | Paul K. Lerpae | Visual Effects |
| Writing | Julien Duvivier | Original Film Writer |
| Writing | Henri Jeanson | Original Film Writer |
| Camera | Robert Willoughby | Still Photographer |
| Camera | Vincent Rossell | Still Photographer |
