 | Karlheinz Böhm als Mark Lewis |
 | Anna Massey als Helen Stephens |
 | Moira Shearer als Vivian |
 | Maxine Audley als Mrs. Stephens |
 | Brenda Bruce als Dora |
 | Miles Malleson als Elderly Gentleman Customer |
 | Esmond Knight als Arthur Baden |
 | Michael Goodliffe als Don Jarvis |
 | Jack Watson als Chief Insp. Gregg |
 | Shirley Anne Field als Pauline Shields |
 | Pamela Green als Milly |
 | John Barrard als Small Man (uncredited) |
 | Robert Crewdson als Shop Assistant on Film Set (uncredited) |
 | Nigel Davenport als Det. Sgt. Miller (uncredited) |
 | Michael Powell als Mark's Father - A.N. Lewis (uncredited) |
 | Susan Travers als Lorraine the Model (uncredited) |
 | Martin Miller als Dr. Rosen |
 | Keith Baxter als Det. Baxter (uncredited) |
| John Chappell als Clapper Boy (uncredited) |
 | Roland Curram als Young Man in Sports Car (uncredited) |
| John Dunbar als Police Doctor (uncredited) |
| Maurice Durant als Publicity Chief (uncredited) |
 | Paddi Edwards als Girl Electrician (uncredited) |
 | Cornelia Frances als Girl in Sports Car Leaving Studio (uncredited) |
 | Veronica Hurst als Miss Simpson - Jarvis' Secretary (uncredited) |
| M. Le Compte als Lover in Garden (uncredited) |
| Mme. Le Compte als Lover in Garden (uncredited) |
| Bartlett Mullins als Mr. Peters - News Agent Shop Owner (uncredited) |
| Pete Murray als Young Man Embracing Girl (uncredited) |
| Margaret Neale als Mark's Stepmother (uncredited) |
| Columba Powell als Mark as a Child (uncredited) |
| Guy Kingsley Poynter als P. Tate - Studio Cameraman (uncredited) |
| Frankie Reidy als Mark's Mother on Deathbed (uncredited) |
| Alan Rolfe als Store Detective (uncredited) |
| Frank Singuineau als Electrician #1 (uncredited) |
 | Peggy Thorpe-Bates als Mrs. Partridge (uncredited) |
| Robert Vossler als Policeman (uncredited) |
| Brian Wallace als Tony - Downstairs Lodger in Lewis' House (uncredited) |
 | Brian Worth als Assistant Director (uncredited) |
| Michael Powell | Producer |
| Noreen Ackland | Editor |
| Otto Heller | Director of Photography |
| Brian Easdale | Original Music Composer |
| Michael Powell | Director |
| Leo Marks | Screenplay |
| Leo Marks | Original Story |
| Arthur Lawson | Art Direction |
| Gordon K. McCallum | Sound Mixer |
| Pearl Orton | Hairstylist |
| Gordon K. McCallum | Sound Recordist |
| W.T. Partleton | Makeup Artist |
| Malcolm Cooke | Sound Editor |
| C. C. Stevens | Sound Recordist |
| Gordon K. McCallum | Sound Designer |
| Ted Sturgis | Assistant Director |
| Jim Body | Focus Puller |
| Gerry Turpin | Camera Operator |
| Gordon Watson | Musician |
| Brian Easdale | Music Director |
| Tommy Linden | Choreographer |
| Denis Johnson Jr | Second Assistant Director |
| Rita Davison | Continuity |
| Nat Cohen | Presenter |
| Bill Burnside | Publicist |
| Albert Fennell | Associate Producer |
| Stuart Levy | Presenter |
| Carl Mannin | Third Assistant Director |
| Don Picton | Set Dresser |
| Vic Smith | Electrician |
| Norman Gryspeerdt | Still Photographer |
| Judith Coxhead | Production Assistant |
| Derek V. Browne | Focus Puller |
| Bill Paton | Production Assistant |
| Maurice Pelling | Draughtsman |
| Alfred W. Marcus | Production Manager |
| Ivor Beddoes | Assistant Art Director |
| Alma Godfrey | Assistant Editor |
| John Rushton | Assistant Editor |
| Ronnie Udell | Construction Manager |
