| Basil Rathbone | Sherlock Holmes |
| Nigel Bruce | Doctor Watson |
| Gale Sondergaard | Adrea Spedding |
| Dennis Hoey | Inspector Lestrade |
| Vernon Downing | Norman Locke |
| Alec Craig | Henchman Radlik |
| Arthur Hohl | Adam Gilflower |
| Mary Gordon | Mrs. Hudson |
| Sylvia Andrew | Charwoman |
| Marie De Becker | Charwoman |
| Evelyn Ankers | |
| Paul Cavanagh | |
| Rondo Hatton | |
| Miles Mander | |
| Aubrey Mather | |
| Lydia Bilbrook | Colonel's wife |
| Director | Roy William Neill |
| Producer | Roy William Neill |
| Writer | Bertram Millhauser; Arthur Conan Doyle |
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