 | Ingrid Bergman als Gerda Millett |
 | Rex Harrison als The Marquess of Frinton |
 | Shirley MacLaine als Mae Jenkins |
 | Jeanne Moreau als The Marchioness of Frinton |
 | George C. Scott als Paolo Maltese |
 | Omar Sharif als Davich |
 | Alain Delon als Stefano |
 | Art Carney als Joey Friedlander |
 | Joyce Grenfell als Hortense Astor |
 | Edmund Purdom als Fane |
 | Michael Hordern als Harnsworth |
 | Lance Percival als Assistant Car Salesman |
 | Roland Culver als Norwood |
 | Moira Lister als Lady St. Simeon |
 | Harold Scott als Taylor |
 | Richard Pearson als Osborn |
 | Isa Miranda als Duchesse d'Angoulême |
 | Grégoire Aslan als Albanian Ambassador |
 | Riccardo Garrone als Bomba |
 | Wally Cox als Ferguson |
 | Carlo Croccolo als Michele |
 | Guy Deghy als Mayor |
 | Martin Miller als Head Waiter |
 | Reginald Beckwith als Reporter |
 | Jacques Brunius als Duc de d'Angouleme (England) (uncredited) |
 | Anthony Dawson als Mickey (uncredited) |
 | Harold Kasket als Italian Garage Owner (uncredited) |
 | Frank Williams als Racegoer (uncredited) |
| Lewis Alexander als Ascot Attendee (uncredited) |
| Jack Arrow als Bellboy (uncredited) |
| Hyma Beckley als Ascot Racegoer (uncredited) |
| Reginald Beckwith als Reporter (uncredited) |
| Paul Beradi als Ascot Attendee (uncredited) |
| Ernest Blyth als Ascot Attendee (uncredited) |
| Daniel Brown als Partisan (uncredited) |
 | Jonathan Cecil als (uncredited) |
| Pauline Chamberlain als Woman in Green Gown at Banquet (uncredited) |
| Harold Coyne als Ascot Attendee (uncredited) |
| Maxwell Craig als Ascot Usher (uncredited) |
| Roy Everson als Ascot Attendee (uncredited) |
| Tom Gill als (uncredited) |
| Charles Gilliard als Wounded Man (uncredited) |
| Philippa Hare als Dinner Guest (uncredited) |
 | Victor Harrington als Ascot Attendee (uncredited) |
| George Holdcroft als Dinner Guest (uncredited) |
| Max Howard als Boy in Stately Home (uncredited) |
| Gerry Judge als Bookie (uncredited) |
| Dermot Kelly als Marquess of Frinton's Jockey (uncredited) |
 | Juba Kennerley als Dinner Guest (uncredited) |
| John Lynn als Stevedore (uncredited) |
| Andreas Malandrinos als Italian Hotel Manager (uncredited) |
| Jack Mandeville als Dinner Guest (uncredited) |
| Louis Matto als Waiter (uncredited) |
| Mary Maxfield als Ascot Attendee (uncredited) |
| John More als Dinner Guest (uncredited) |
 | Robert Nichols als American Travel Agent (uncredited) |
| James Payne als Man at Car Sales (uncredited) |
| Harry Phipps als Partisan (uncredited) |
 | Ernie Rice als Servant (uncredited) |
 | Robert Rietti als Hotel Manager (uncredited) |
| George Roderick als Italian waiter (uncredited) |
| Bunny Seaman als Ascot Attendee (uncredited) |
 | Bill Shine als Minor Role (uncredited) |
| Philip Stewart als Ascot Racegoer (uncredited) |
| John Tatham als Ascot Attendee (uncredited) |
| Reg Thomason als Florence Restaurant Patron (uncredited) |
| Oliver Tomlin als Ascot Attendee (uncredited) |
| Joseph Tregonino als Italian Restaurant Waiter (uncredited) |
 | Richard Vernon als Race Course Official (uncredited) |
| Anthony Asquith | Director |
| Terence Rattigan | Screenplay |
| Pamela Carlton | Continuity |
| Eddie Frewin | Transportation Captain |
| Chris Kelly | Assistant Editor |
| Anatole de Grunwald | Producer |
| Roy Parkinson | Associate Producer |
| Riz Ortolani | Original Music Composer |
| Jack Hildyard | Director of Photography |
| Frank Clarke | Editor |
| Irene Howard | Casting |
| John Jarvis | Set Decoration |
| Sydney Guilaroff | Hairstylist |
| John O'Gorman | Makeup Artist |
| Giorgio Sciommer | Hairstylist |
| Tom Smith | Makeup Artist |
| Timothy Burrill | Production Manager |
| Jimmy Komisarjevsky | Unit Manager |
| Kip Gowans | Assistant Director |
| Robert Watts | Second Assistant Director |
| William Kellner | Art Direction |
| Vincent Korda | Art Direction |
| Reg Bream | Draughtsman |
| Maurice Fowler | Assistant Art Director |
| John Graysmark | Draughtsman |
| Terry Knight | Assistant Art Director |
| Mickey Lennon | Dressing Prop |
| Kenneth McCallum Tait | Assistant Art Director |
| Ted Tester | Draughtsman |
| Philip Barnikel | Sound Editor |
| Cyril Swern | Sound Recordist |
| A.W. Watkins | Recording Supervision |
| Tom Howard | Special Effects |
| Austin Dempster | Camera Operator |
| Gerry Fisher | Camera Operator |
| Chic Anstiss | Focus Puller |
| Wally Fairweather | Focus Puller |
| Denis Fraser | Grip |
| Douglas Milsome | Clapper Loader |
| Rebecca Breed | Wardrobe Supervisor |
| Pamela Cornell | Set Decoration |
| Elliot Scott | Art Direction |
| Edith Head | Costume Design |
| Norman Newell | Lyricist |
| Katyna Ranieri | Songs |
| Riz Ortolani | Conductor |
| Antonio Cánovas del Castillo de Rey | Costume Design |
| Gene Coffin | Costume Design |
| Anthony Mendleson | Costume Design |
| Pierre Cardin | Costume Design |
| Maria Carita | Hairstylist |
| Rosy Carita | Hairstylist |
| Joan Johnstone | Hairdresser |
| J.B. Smith | ADR & Dubbing |
| Douglas Adamson | Second Unit Cinematographer |
| George Davis | Production Accountant |
