 | Claude Rains als Dr. Jack Griffin |
 | Gloria Stuart als Flora Cranley |
 | William Harrigan als Dr. Arthur Kemp |
 | Henry Travers als Dr. Cranley |
 | Una O'Connor als Jenny Hall |
 | Forrester Harvey als Herbert Hall |
 | Holmes Herbert als Chief of Police |
 | E. E. Clive als Constable Jaffers |
 | Dudley Digges als Chief Detective |
 | Harry Stubbs als Inspector Bird |
 | Donald Stuart als Inspector Lane |
 | Merle Tottenham als Millie |
 | Robert Adair als Detective Thompson (uncredited) |
 | Edgar Barrier als Radio Announcer (uncredited) |
 | Ted Billings als Villager Playing Darts (uncredited) |
 | Walter Brennan als Bicycle Owner (uncredited) |
 | Robert Brower als Farmer (uncredited) |
 | Mae Bruce als Mary Purdy (uncredited) |
 | Rita Carlyle als Townswoman at Pub (uncredited) |
 | John Carradine als Informer Suggesting Ink (uncredited) |
 | D'Arcy Corrigan als Villager (uncredited) |
| Jack Deery als Officer in Charge of Barn Capture (uncredited) |
 | Dwight Frye als Reporter (uncredited) |
 | Mary Gordon als Screaming Woman (uncredited) |
| Bobby Hale als Townsman at Pub (uncredited) |
| Stuart Hall als Constable (uncredited) |
| Tiny Jones als Townswoman at Pub (uncredited) |
 | Violet Kemble Cooper als Woman (uncredited) |
 | Crauford Kent als Doctor (uncredited) |
 | Paul Kruger als Constable (uncredited) |
 | John Merivale als Constable (uncredited) |
 | Monte Montague als Cop (uncredited) |
 | Jack Montgomery als Constable (uncredited) |
 | Charles Morton als Party Guest (uncredited) |
 | Bob Reeves als Detective Hogan (uncredited) |
 | Jack Richardson als Official (uncredited) |
 | Tom Ricketts als Old Farmer with Barn (uncredited) |
 | Kathryn Sheldon als Orphanage Worker (uncredited) |
| Emma Tansey als Old Woman Listening to Radio (uncredited) |
 | Jameson Thomas als Hospital Doctor (uncredited) |
 | Leo White als 2nd Man Calling Police ('Frost')(uncredited) |
| Bert Young als Railroad Switchman (uncredited) |
| Heinz Roemheld | Original Music Composer |
| Ted J. Kent | Editor |
| James Whale | Director |
| R.C. Sherriff | Screenplay |
| H.G. Wells | Novel |
| Arthur Edeson | Director of Photography |
| Carl Laemmle Jr. | Producer |
| Charles D. Hall | Art Direction |
| Wally Kirkpatrick | Props |
| Roswell A. Hoffmann | Visual Effects |
| Roman Freulich | Still Photographer |
| Fred Stoll | Grip |
| John P. Fulton | Special Effects |
| Jack Pierce | Makeup Artist |
| Frank D. Williams | Visual Effects Supervisor |
| Preston Sturges | Writer |
| Philip Wylie | Writer |
| Joseph A. McDonough | Assistant Director |
| William Hedgcock | Sound Recordist |
| John Kemp | Sound Recordist |
| Gilbert Kurland | Sound Supervisor |
| Cleo E. Baker | Visual Effects |
| Bill Heckler | Visual Effects |
| Roswell A. Hoffmann | Visual Effects Camera |
| John J. Mescall | Visual Effects Camera |
| Peter Abriss | Grip |
| Jack Eagan | Assistant Camera |
| Arthur Edeson | Camera Operator |
| King D. Gray | Camera Operator |
| John J. Mescall | Director of Photography |
| Maurice Pivar | Editorial Manager |
| W. Franke Harling | Music |
| Gilbert Kurland | Music Supervisor |
| Heinz Roemheld | Conductor |
| William Schiller | Orchestrator |
| Carl Laemmle | Presenter |
