 | Audrey Hepburn als Princess Ann |
 | Gregory Peck als Joe Bradley |
 | Eddie Albert als Irving Radovich |
 | Hartley Power als Mr. Hennessy |
 | Harcourt Williams als Ambassador |
 | Margaret Rawlings als Countess Vereberg |
 | Tullio Carminati als Gen. Provno |
 | Paolo Carlini als Mario Delani |
 | Claudio Ermelli als Giovanni |
 | Paola Borboni als Charwoman |
 | Alfredo Rizzo als Cab driver |
 | Laura Solari als Hennessy's Secretary |
 | Gorella Gori als Shoe Seller |
 | Armando Annuale als Admiral Dancing with Princess (uncredited) |
 | Maurizio Arena als Young Boy with Car (uncredited) |
 | Gildo Bocci als Flower Seller (uncredited) |
| Andrea Esterhazy als Embassy Aide (uncredited) |
 | George Higgins als Correspondent at Poker Game (uncredited) |
 | Richard McNamara als Correspondent at Poker Game (uncredited) |
| Luigi Moneta als Old Man Dancing with Princess (uncredited) |
| Piero Pastore als Faceless Man on the Barge (uncredited) |
 | Mimmo Poli als Worker Hugging the Three Out Side Police Station (uncredited) |
 | Giuliano Raffaelli als Faceless Man on the Barge (uncredited) |
 | Carlo Rizzo als Police Official (uncredited) |
 | Gianna Segale als Girl at Cafe Waving at Irving (uncredited) |
| Dianora Veiga als Girl at Cafe Waving at Irving (uncredited) |
 | Marco Tulli als Pallid Young Man Dancing with Princess (uncredited) |
| Tania Weber als Francesca - Irving's Model (uncredited) |
| Catherine Wyler als Schoolgirl (uncredited) |
 | Nadia Balabine als (uncredited) |
| Robert Swink | Editor |
| Henri Alekan | Director of Photography |
| Hal Pereira | Art Direction |
| Georges Auric | Original Music Composer |
| William Wyler | Director |
| John Dighton | Screenplay |
| Ian McLellan Hunter | Screenplay |
| William Wyler | Producer |
| Joseph de Bretagne | Sound Designer |
| Edith Head | Costume Design |
| Lester Koenig | Associate Producer |
| Victor Young | Additional Soundtrack |
| Robert Belcher | Assistant Editor |
| Leo Shuken | Orchestrator |
| Herbert Coleman | Assistant Director |
| Charles Woolstenhulme | Unit Production Manager |
| Italo Tomassi | Set Designer |
| Anna Cristofani | Hairstylist |
| Maurizio Lodi-Fè | Unit Production Manager |
| Enzo Barboni | Camera Operator |
| Walter H. Tyler | Art Direction |
| Bernard Vorhaus | Assistant Director |
| Vittorio Valentini | Art Direction |
| Joseph de Bretagne | Sound Recordist |
| Alberto De Rossi | Makeup Supervisor |
| Dalton Trumbo | Story |
| Robert Wyler | Associate Producer |
| Franz Planer | Director of Photography |
| Dalton Trumbo | Screenplay |
| Wally Westmore | Makeup Supervisor |
