Sherlock Holmes
Basil Rathbone
Dr. John H. Watson
Nigel Bruce
Fred Garvin (uncredited)
Harry Cording
Fortune Teller (uncredited)
Belle Mitchell
Obongo - Pygmy (uncredited)
Angelo Rossitto
Charwoman (uncredited)
Sylvia Andrew
Marie De Becker
News Vendor (uncredited)
Jimmy Aubrey
Carnival Patron (uncredited)
Brandon Beach
Toy Doll Attendant (uncredited)
Frank Benson
Susan (uncredited)
Lydia Bilbrook
Radio Announcer (uncredited)
John Burton
Adrea Spedding
Gale Sondergaard
Casino Patron (uncredited)
James Carlisle
Jack Deery
George Kirby
Robert (uncredited)
Stanley Logan
Wilbur Mack
Edmund Mortimer
Doorman (uncredited)
William H. O'Brien
Casino Croupier (uncredited)
John Roche
Henchman Taylor (uncredited)
Gene Roth
Plainclothesman (uncredited)
Arthur Stenning
Insp. Lestrade
Dennis Hoey
Florence Wix
Herschel Graham
Ethelreda Leopold
Norman Locke
Vernon Downing
Radlik
Alec Craig
Adam Gilflower
Arthur Hohl
Mrs. Hudson
Mary Gordon
Larry (uncredited)
Teddy Infuhr
Artie - Shooting Gallery Attendant (uncredited)
Donald Stuart
Story
Arthur Conan Doyle
Director
Roy William Neill
Producer
Screenplay
Bertram Millhauser
Director of Photography
Charles Van Enger
Editor
William Austin
Art Direction
John B. Goodman
Martin Obzina
Set Decoration
Russell A. Gausman
Edward R. Robinson
Costume Design
Vera West
Sound Director
Bernard B. Brown
Music Director
Hans J. Salter