Sherlock Holmes
Basil Rathbone
Doctor Watson
Nigel Bruce
Geoffrey Musgrave
Frederick Worlock
Gracie the Barmaid
Norma Varden
Young Sailor at Bar
Peter Lawford
Heather Wilde
Captain MacIntosh
Olaf Hytten
Sailor Playing Piano
Eric Snowden
Inspector Lestrade
Dennis Hoey
Sally Musgrave
Hillary Brooke
Mrs. Hudson
Mary Gordon
Alfred Brunton, the butler
Halliwell Hobbes
Capt. Pat Vickery
Milburn Stone
Mrs. Howells
Minna Phillips
Dr. Bob Sexton
Arthur Margetson
Phillip Musgrave
Gavin Muir
Story
Arthur Conan Doyle
Director
Roy William Neill
Producer
Screenplay
Bertram Millhauser
Director of Photography
Charles Van Enger
Art Direction
John B. Goodman
Harold H. MacArthur
Editor
Fred R. Feitshans Jr.
Costume Design
Vera West
Sound Designer
Edwin Wetzel
Set Decoration
Russell A. Gausman
Edward R. Robinson