 | Gary Cooper als Frank Flannagan |
 | Audrey Hepburn als Ariane Chavasse / Thin Girl |
 | Maurice Chevalier als Claude Chavasse |
 | John McGiver als Monsieur X |
 | Van Doude als Michel |
 | Lise Bourdin als Madame X |
 | Olga Valéry als Hotel Guest with Dog |
 | Paul Bonifas als Police Chief (uncredited) |
 | Audrey Long als Brunette (uncredited) |
 | Charles Lemontier als General (uncredited) |
 | Eve Marley als Tandemist (uncredited) |
 | Moustache als Butcher (uncredited) |
 | Jean Ozenne als Ritz Receptionist (uncredited) |
 | Marcelle Praince als Rich Woman (uncredited) |
 | Betty Schneider als Couple Drenched by Water Wagon (uncredited) |
| Alexandre Trauner als Artist (uncredited) |
 | Audrey Young als Frank's Opera Date (uncredited) |
| Hubert de Givenchy | Costume Design |
| Billy Wilder | Director |
| Jay A. Morley Jr. | Costume Design |
| Alexandre Trauner | Art Direction |
| Billy Wilder | Screenplay |
| William C. Mellor | Director of Photography |
| Harry L. Underwood | Camera Operator |
| Billy Wilder | Producer |
| I. A. L. Diamond | Screenplay |
| Léonide Azar | Editor |
| Claude Anet | Novel |
| Alexandre Trauner | Production Design |
| William Schorr | Associate Producer |
| Doane Harrison | Associate Producer |
| Paul Feyder | Assistant Director |
| Joseph de Bretagne | Sound Recordist |
| Del Harris | Sound Editor |
| Robert Tracy | Music Editor |
| Lee Katz | Associate Producer |
| Chester W. Schaeffer | Editor |
| Oliver Emert | Set Decoration |
| John G. Holden | Makeup Artist |
| Edward Dodds | Production Manager |
| Paul Feyder | First Assistant Director |
| Noël Howard | Second Unit Director |
| Alain Boudet | Second Assistant Director |
| Ray Taylor Jr. | Assistant Director |
| Maurice Barnathan | Set Dresser |
| Auguste Capelier | Assistant Art Director |
| Lucie Lichtig | Script Supervisor |
| Winifred Gibson | Script Supervisor |
| Albert Sendrey | Orchestrator |
| Christian Ferry | Location Manager |
