 | Marilyn Monroe als Elsie |
 | Laurence Olivier als The Regent |
 | Sybil Thorndike als The Queen Dowager |
 | Richard Wattis als Northbrook |
 | Jeremy Spenser als King Nicolas |
 | David Horne als The Foreign Office |
 | Harold Goodwin als Call Boy |
 | Gladys Henson als Dresser |
 | Jean Kent als Maisie Springfield |
 | Charles Victor als Theatre Manager |
 | Daphne Anderson als Fanny |
 | Vera Day als Betty |
 | Gillian Owen als Maggie |
 | Esmond Knight als Hoffman |
| Paul Hardwick als Major Domo |
 | Rosamund Greenwood als Maud |
| Andreas Malandrinos als Valet with Violin |
| Margot Lister als Lottie |
 | Aubrey Dexter als The Ambassador |
 | Maxine Audley als Lady Sunningdale |
| Dennis Edwards als Head Valet |
| Paul Beradi als Dignitary (Uncredited) |
 | Carole Gray als Dancer (Uncredited) |
| Aileen Lewis als Dignitary (Uncredited) |
 | Dido Plumb als Dignitary (Uncredited) |
| Laurence Olivier | Director |
| Terence Rattigan | Screenplay |
| Laurence Olivier | Producer |
| Richard Addinsell | Original Music Composer |
| Jack Cardiff | Director of Photography |
| Roger K. Furse | Production Design |
| Carmen Dillon | Art Direction |
| Beatrice Dawson | Costume Design |
| Anthony Bushell | Assistant Director |
| Denys N. Coop | Camera Operator |
| Edward Joseph | Production Manager |
| David W. Orton | Assistant Director |
| Jack Harris | Editor |
| Muir Mathieson | Music Director |
| Ted Drake | Other |
| William Chappell | Choreographer |
| Dario Simoni | Set Dresser |
| Elaine Schreyeck | Continuity |
| Tony Sforzini | Makeup Artist |
| Gordon Bond | Hairstylist |
| Bill Warrington | Special Effects |
| Charles Staffell | Special Effects |
| John W. Mitchell | Sound Recordist |
| Gordon K. McCallum | Sound Recordist |
| Hugh Perceval | Executive In Charge Of Production |
| Milton H. Greene | Executive Producer |
| Wally Fairweather | Focus Puller |
| Terence Rattigan | Theatre Play |
| Marilyn Monroe | Executive Producer |
| Weston Drury Jr. | Casting |
| Daphne Vollmer | Assistant Hairdresser |
| John Wilcox | Assistant Makeup Artist |
| Geoffrey Haine | Third Assistant Director |
| Luciano Sacripanti | Third Assistant Director |
| David Tringham | Third Assistant Director |
| Ernest Archer | Assistant Art Director |
| Terence Marsh | Draughtsman |
| Ronnie Udell | Construction Manager |
| Roy Charman | Boom Operator |
| Danny Daniel | Boom Operator |
| Harry Fairbairn | Sound Assistant |
| Peter Melrose | Matte Painter |
| Reg Johnson | Assistant Camera |
| James Swarbrick | Still Photographer |
| Lynda Swarbrick | Still Photographer |
| John Briggs | Wardrobe Master |
| Vi Murray | Wardrobe Master |
| Jocelyn Rickards | Assistant Costume Designer |
| May Walding | Dresser |
| Douglas Gamley | Orchestrator |
| Alan Arnold | Unit Publicist |
| Norma Garment | Production Secretary |
| Una Pearl | Stand In |
| Paula Strasberg | Dialogue Coach |
