 | Richard Widmark als Harry Fabian |
 | Francis L. Sullivan als Philip Nosseross |
 | Gene Tierney als Mary Bristol |
 | Googie Withers als Helen Nosseross |
 | Stanislaus Zbyszko als Gregorius |
 | Herbert Lom als Kristo |
 | Hugh Marlowe als Adam Dunn |
 | Mike Mazurki als The Strangler |
 | Charles Farrell als Mickey Beer |
 | Ada Reeve als Molly |
 | Ken Richmond als Nikolas |
 | Alan Tilvern als Beggar (uncredited) |
 | Derek Blomfield als Young Policeman (uncredited) |
 | Clifford Buckton als Policeman (uncredited) |
 | Ernest Butcher als Bert, Street Musician (uncredited) |
 | Peter Butterworth als Thug (uncredited) |
 | Naomi Chance als Nightclub Hostess (uncredited) |
 | Edward Chapman als Hoskins (uncredited) |
| Clifford Cobbe als Policeman (uncredited) |
| Patricia Davidson als Nightclub Hostess (uncredited) |
 | Maureen Delaney als Anna O'Leary (uncredited) |
 | Aubrey Dexter als Fergus Chilk (uncredited) |
| Stanley Escane als Man (uncredited) |
| Thomas Gallagher als Bagrag, Bar Owner (uncredited) |
| Rex Garner als Waiter (uncredited) |
 | James Hayter als Figler (uncredited) |
| George Hirste als Beggar (uncredited) |
| Hamilton Keene als Charles, American Bartender (uncredited) |
 | Kay Kendall als Helen's Girl (uncredited) |
| Hubert Leslie als Nightwatchman (uncredited) |
| Arthur Lovegrove als Thug (uncredited) |
| Jack Mandeville als Man in Alley (uncredited) |
| John Mann als Beggar (uncredited) |
| Lew Marco als Referee (uncredited) |
 | Gibb McLaughlin als Googin (uncredited) |
 | MacDonald Parke als American from Chicago (uncredited) |
| Frank Pettitt als Cab Driver (uncredited) |
 | Charles Paton als Watchman (uncredited) |
| Chunky Pattison als Dwarf (uncredited) |
 | Philip Ray als Man (uncredited) |
| Eddy Reed als American from Chicago (uncredited) |
| John Rudling als Man (uncredited) |
| Harold Sanderson als Man at Wrestling Match (uncredited) |
 | Johnnie Schofield als Cashier (uncredited) |
| Betty Shale als Mrs. Pinkney (uncredited) |
 | John Sharp als Man (uncredited) |
| Leonard Sharp als Beggar (uncredited) |
| Ray St. Bernard als The Strangler's Opponent (uncredited) |
| Tony Sympson als Cozen (uncredited) |
 | Harry Terry als Man on Dock (uncredited) |
 | C. Denier Warren als American from Chicago (uncredited) |
| Freddie Watts als Man (uncredited) |
 | Brian Weske als Messenger Boy (uncredited) |
| Russell Westwood als Yosh (uncredited) |
| Jules Dassin | Director |
| Jo Eisinger | Screenplay |
| Gerald Kersh | Novel |
| Samuel G. Engel | Producer |
| Darryl F. Zanuck | Executive Producer |
| Mutz Greenbaum | Director of Photography |
| C.P. Norman | Art Direction |
| Franz Waxman | Original Music Composer |
| Benjamin Frankel | Original Music Composer |
| Austin Dempster | Writer |
| William E. Watts | Writer |
| Nick DeMaggio | Editor |
| Sidney Stone | Editor |
| David Aylott | Makeup Artist |
| Peter Handford | Sound Recordist |
| Roger Heman Sr. | Sound Recordist |
| Anthony Hearne | First Assistant Director |
| Weston Drury Jr. | Casting |
| Douglas Fairbanks Jr. | Casting |
| Eric Allwright | Assistant Makeup Artist |
| Barbara Ritchie | Hairstylist |
| Iris Tilley | Hairstylist |
| Percy Hermes | Unit Manager |
| Ronald Kinnoch | Production Manager |
| Bert Pearl | Assistant Production Manager |
| Jack N. Green | Third Assistant Director |
| Douglas Hermes | Second Assistant Director |
| Percy Hermes | Assistant Director |
| George Mills | Assistant Director |
| Peter Mullins | Third Assistant Director |
| George Beech | Draughtsman |
| Ted Clements | Draughtsman |
| Peter Mullins | Assistant Art Director |
| Peter Murton | Draughtsman |
| Hugh Strain | Sound Assistant |
| Kevin Sutton | Sound Assistant |
| Charles Van der Goor | Sound |
| Hal Britten | Camera Operator |
| V. Butler | Grip |
| Austin Dempster | Camera Operator |
| Eddie Earp | Clapper Loader |
| Arthur Evans | Still Photographer |
| John Street | Second Assistant Director |
| Godfrey A. Godar | Focus Puller |
| Jo Jago | Additional Director of Photography |
| Walter Lassally | Focus Puller |
| David Oxenham | Clapper Loader |
| A. Southall | Grip |
| Joe Vincent | Grip |
| John Jones | Casting Assistant |
| Oleg Cassini | Costume Design |
| Margaret Furse | Costume Design |
| Ivy Baker | Wardrobe Supervisor |
| Evelyn Gibbs | Wardrobe Master |
| Arthur Newman | Wardrobe Master |
| Muir Mathieson | Music Director |
| Edward B. Powell | Orchestrator |
| Bernard Mayers | Orchestrator |
| Cyril J. Mockridge | Orchestrator |
| Eric Rogers | Orchestrator |
| Arthur Allighan | Unit Publicist |
| Ernest Betts | Publicist |
| R. E. Dearing | Producer's Assistant |
| Noreen Hipwell | Production Secretary |
| Mike Mazurki | Technical Advisor |
| Peggy McClafferty | Continuity |
