 | Dirk Bogarde als Dr. Henry Laidlaw Longman |
 | Mary Ure als Oonagh Longman |
 | John Clements als Major Hall |
 | Michael Bryant als Dr. Danny Tate |
 | Wendy Craig als Annabella |
 | Harold Goldblatt als Professor Sharpey |
 | Geoffrey Keen als Calder |
 | Terry Palmer als Norman |
 | Norman Bird als Aubrey |
 | Terence Alexander als Rowing Coach (uncredited) |
 | Grace Arnold als Train Passenger (uncredited) |
| Timothy Beaton als Paul Longman (uncredited) |
 | Elizabeth Counsell als Girl Student on Station (uncredited) |
 | Roger Delgado als Dr. Jean Bonvoulois (uncredited) |
| Ian Dewar als Crowd Ringleader (uncredited) |
| Geoffrey Denton als Train Guard (uncredited) |
| Ashik Devello als 2nd Indian Student (uncredited) |
 | Terence Edmond als 1st Student at Party (uncredited) |
 | Christopher Ellis als Peers Longman (uncredited) |
 | Edward Fox als Stewart (uncredited) |
 | Imogen Hassall als Student (uncredited) |
 | Robin Hawdon als Student (uncredited) |
| Georgina Moon als Persephone Longman (uncredited) |
| Edward Palmer als Porter (uncredited) |
 | Philip Ray als Father (uncredited) |
 | Renu Setna als 1st Indian Student (uncredited) |
| Anthony Singleton als Boy Student on Station (uncredited) |
| Teresa Van Hoorn als Penny Longman ( uncredited) |
 | David Weston als Student at Party (uncredited) |
| Pauline Winter als Mother (uncredited) |
| Charles Orme | Production Manager |
| James Kennaway | Screenplay |
| Michael Relph | Producer |
| Georges Auric | Original Music Composer |
| Basil Dearden | Director |
| Anthony Mendleson | Costume Design |
| John D. Guthridge | Editor |
| Denys N. Coop | Director of Photography |
| Susan Dyson | Continuity |
| Muir Mathieson | Conductor |
| Robert T. MacPhee | Sound Re-Recording Mixer |
| Basil Rayburn | Assistant Director |
| Pearl Orton | Hairdresser |
| Jim Morahan | Art Direction |
| Bill Surridge | Construction Manager |
| Gordon K. McCallum | Sound Recordist |
| Vivian Temple-Smith | Sound Recordist |
| Eric Besche | Camera Operator |
| Harry Frampton | Makeup Artist |
