Basil Rathbone as Baron Wolf von Frankenstein

Boris Karloff as The Monster

Bela Lugosi as Ygor

Lionel Atwill as Inspector Krogh

Josephine Hutchinson as Elsa von Frankenstein

Donnie Dunagan as Peter von Frankenstein

Emma Dunn as Amelia

Edgar Norton as Thomas Benson

Perry Ivins as Fritz

Lawrence Grant as Bürgermeister

Lionel Belmore as Emil Lang

Michael Mark as Ewald Neumüller

Caroline Frances Cooke as Frau Neumüller

Gustav von Seyffertitz as Burgher

Lorimer Johnston as Burgher

Tom Ricketts as Burgher

Ward Bond as Gendarme at Gate (uncredited)

Betty Chay as Undetermined Role (uncredited)

Harry Cording as Bearded Gendarme (uncredited)

Jack Curtis as Actor (uncredited)

Fred Farrell as Villager (uncredited)

Jack Harris as Extra (uncredited)

Russ Powell as Webber - Burgher (uncredited)

Clarence Wilson as Dr. Berger (uncredited)