Basil Rathbone

Sherlock Holmes

Nigel Bruce

Dr. John Watson

Hillary Brooke

Lydia Marlowe

Henry Daniell

Professor James Moriarty

Paul Cavanagh

Sir George Fenwick

Matthew Boulton

Inspector Gregson

Eve Amber

Maude Fenwick

Frederick Worlock

Dr. Onslow

Percival Vivian

Dr. Simnell

Coulter Irwin

Corporal Williams

Sally Shepherd

Crandon

Mary Gordon

Mrs. Hudson

John Burton

Waring the Mesmerist (uncredited)

Harold De Becker

Shoelace Vendor Henchman (uncredited)

Tony Ellis

Carter the Hypnotized Subject (uncredited)

Bess Flowers

Bar Patron (seen in mirror) (uncredited)

Kay Harding

4th Victim (uncredited)

Alec Harford

Commissioner of the CID (uncredited)

Olaf Hytten

Fenwick's Butler Norris (uncredited)

Boyd Irwin

Short-Tempered Officer Closing Window (uncredited)

Eric Mayne

Member of Mesmer Club (uncredited)

William H. O'Brien

Pembrook House Waiter (uncredited)

Roy William Neill

Producer

Roy William Neill

Director

Virgil Miller

Director of Photography

Edward Curtiss

Editor

John B. Goodman

Art Direction

Russell A. Gausman

Set Decoration

John P. Fulton

Special Effects

Vera West

Costume Design

Melville Shyer

Assistant Director

Bertram Millhauser

Screenplay

Mark Levant

Music Director

Martin Obzina

Art Direction

Bernard B. Brown

Sound Director

Ted von Hemert

Set Decoration

Roswell A. Hoffmann

Camera Operator

Arthur Conan Doyle

Novel