 | Julie Christie als Diana Scott |
 | Dirk Bogarde als Robert Gold |
 | Laurence Harvey als Miles Brand |
 | José Luis de Vilallonga als Prince Cesare della Romita |
 | Roland Curram als Malcolm |
 | Basil Henson als Alec Prosser-Jones |
 | Dante Posani als Gino |
 | Umberto Raho als Signor Palucci |
 | Alex Scott als Sean Martin |
 | Brian Wilde als Basil Willett |
 | Peter Bayliss als Lord Alex Grant |
 | T.R. Bowen als Tony Bridges (as Trevor Bowen) |
 | Georgina Cookson als Carlotta Hale |
 | James Cossins als Mr. Basildon |
 | Helen Lindsay als Felicity Prosser-Jones |
 | Carlo Palmucci als Curzio della Romita |
| Ernest Walder als Kurt |
| Pauline Yates als Estelle Gold |
| Richard Bidlake als Rupert Crabtree |
 | Annette Carell als Billie Castiglione |
 | Jean Claudio als Raoul Maxim |
 | Jane Downs als Julie (as Jane Downes) |
 | Marika Rivera als Paris Party Host |
 | Lucille Soong als Allie (uncredited) |
 | Lydia Sherwood als Lady Brentwood (uncredited) |
 | Ann Firbank als Sybil Martin (uncredited) |
 | Tyler Butterworth als William Prosser-Jones (uncredited) |
 | Vernon Dobtcheff als Art Critic at Ralph Riggs Exposure (uncredited) |
 | John Schlesinger als Theatre Director (uncredited) |
 | Silvia Dionisio als Prince Cesare della Romita's Daughter (uncredited) |
 | Victor Harrington als Functionary at Charity Event (uncredited) |
 | Derek Aylward als Party Guest (uncredited) |
 | Zakes Mokae als Black Man at French Party (uncredited) |
| David Harrison als Charles Glass (uncredited) |
| Sidonie Bond als Gillian (uncredited) |
| Margaret Gordon als Helen Dawlish (uncredited) |
| Angus MacKay als Ivor Dawlish (uncredited) |
| Jane Pearl als Jane (uncredited) |
| Irene Richmond als Mrs. Glass (uncredited) |
| Hugo Dyson als Walter Southgate (uncredited) |
| Christopher Greatorex als Art Critic at Ralph Riggs Exposure (uncredited) |
| Hyma Beckley als Guest at Art Gallery Viewing (uncredited) |
| Nicholas Wright als Young Man in Opening Scene (uncredited) |
 | John Woodvine als Customs Officer (uncredited) |
| Helen Stirling als Governess to Cesare Family (uncredited) |
| Ernest Blyth als Man at Airport (uncredited) |
| John Tatum als Man at Tube Station (uncredited) |
 | Roy Lansford als Party Guest (uncredited) |
 | Noel Davis als Shop Assistant (uncredited) |
| Lewis Alexander als Fortnum and Masons Customer (uncredited) |
| Peter Avella als Reporter (uncredited) |
| Jimmy Charters als Man on Tube Station Escalator (uncredited) |
 | Mike Edmonds als Man in Street (uncredited) |
| Peter Evans als Man at Charity Raffle (uncredited) |
| Eden Fox als Waiter (uncredited) |
| Otto Friese als Man in Street (uncredited) |
 | Sheila Gish als Cameo (uncredited) |
| Lew Hooper als Model Agency Staff (uncredited) |
| Gerry Judge als Waiter (uncredited) |
| Anthony Lang als Man at Airport (uncredited) |
| Pat Lewis als Woman at Airport (uncredited) |
| Leonard Llewellyn als Model Agency Staff / Airline Passenger (uncredited) |
 | Ray Lovelock als Undetermined Role (uncredited) |
| Jack Mandeville als Tube Passenger (uncredited) |
| Mary Maxfield als Lady at Charity Raffle (uncredited) |
| Brian Moorehead als Leslie Page (uncredited) |
| Bob Raymond als Waiter / Porter (uncredited) |
| Arnold Schulkes als Mourner (uncredited) |
| Frank Shelley als Father Norton (uncredited) |
| Esme Smythe als Art Gallery Guest (uncredited) |
| Philip Stewart als Guest at Art Gallery Viewing (uncredited) |
| Graham Tonbridge als Art Gallery Guest (uncredited) |
| George Oliver als Tube Passenger (uncredited) |
| Ian Selby als Model Agency Staff (uncredited) |
| John Schlesinger | Director |
| Frederic Raphael | Screenplay |
| Julie Harris | Costume Design |
| Rebecca Breed | Wardrobe Master |
| Ted Southcott | Graphic Designer |
| Stuart A. Black | Second Assistant Director |
| David Ffolkes | Set Decoration |
| Victor Lyndon | Associate Producer |
| Peter Handford | Sound Recordist |
| Ray Simm | Art Direction |
| Mara Blasetti | Location Manager |
| John Aldred | Sound Recordist |
| Tony Curtis | Draughtsman |
| Miriam Brickman | Casting |
| Joseph Janni | Idea |
| John Dankworth | Conductor |
| Joseph Janni | Producer |
| Ed Harper | Unit Manager |
| Joseph E. Levine | Executive Producer |
| Douglas Kirkland | Still Photographer |
| Frederic Raphael | Idea |
| Bob Lawrance | Makeup Artist |
| Jim Clark | Editor |
| Kenneth Higgins | Director of Photography |
| John Schlesinger | Idea |
| Ted Barnes | Scenic Artist |
| John Dankworth | Original Music Composer |
| Ann Skinner | Continuity |
| David Lindup | Orchestrator |
| Kip Gowans | Assistant Director |
| Bernard Ford | Assistant Camera |
| Malcolm Cooke | Sound Editor |
| Robert Watts | Second Assistant Director |
| Joyce James | Hairstylist |
| John Harris | Camera Operator |
| Malcolm Stewart | Sound Engineer |
