The Monster (as Karloff)
Boris Karloff
Henry Frankenstein
Colin Clive
Mary Wollstonecraft Shelley/The Monster's Mate
Elsa Lanchester
Dr. Henry Frankenstein
Colin Clive
Elizabeth Frankenstein
Valerie Hobson
Doctor Pretorius
Ernest Thesiger
Lord Byron
Gavin Gordon
Hermit
O.P. Heggie
Percy Shelley
Douglas Walton
Minnie
Una O'Connor
Burgermeister
E.E. Clive
Bürgomaster (uncredited)
E. E. Clive
Albert (the butler)
Lucien Prival
Percy Shelley
Douglas Walton
Hermit
O.P. Heggie
Karl
Dwight Frye
Hans
Reginald Barlow
Hans' wife
Mary Gordon
Shepherdess
Ann Darling
Ludwig
Ted Billings
Peasant (uncredited)
Walter Brennan
Priest
Lucio Villegas
Hunter (uncredited)
John Carradine
Coroner
Edwin Mordant
Woman
Grace Cunard
Archbishop (uncredited)
Norman Ainsley
Ballerina (uncredited)
Kansas DeForrest
Woman
Helen Gibson
Miniature King
Arthur S. Byron
Little Mermaid (uncredited)
Josephine McKim
Ludwig (archive footage) (uncredited)
Michael Mark
Miniature Queen
Joan Woodbury
Baby (uncredited)
Billy Barty
Hunter in Woods (uncredited)
Robert Adair
Miniature Devil
Peter Shaw
Villager (uncredited)
Frank Benson
Gypsy (uncredited)
Maurice Black
Villager (uncredited)
Mae Bruce
Communion Girl
Helen Parrish
King Homunculus (uncredited)
A.S. Byron
Hunter
Robert A'Dair
Procession Leader (uncredited)
D'Arcy Corrigan
Hunter
Frank Terry
Mother
Brenda Fowler
Hunter (uncredited)
Jack Curtis
Uncle Glutz (uncredited)
J. Gunnis Davis
Neighbor
Rollo Lloyd
Gypsy's Mother (uncredited)
Elspeth Dudgeon
Neighbor
Mary Stewart
Gypsy's Wife (uncredited)
Helen Jerome Eddy
Uncle Glutz
Gunnis Davis
Rudy (uncredited)
Neil Fitzgerald
Aunt Glutz
Tempe Pigott
Mother (uncredited)
Brenda Fowler
Villager (uncredited)
John George
Rudy, Second Graverobber
Neil Fitzgerald
Girl (uncredited)
Marilyn Harris
Marta
Sarah Schwartz
Neighbor (uncredited)
Rollo Lloyd
Villager
Edward Peil Sr.
Victim in flashback (uncredited)
Torben Meyer
Villager
Anders Van Haden
Gypsy
Maurice Black
Maid (uncredited)
Dorothy Vernon
King
A.S. 'Pop' Byron
Priest (uncredited)
Lucio Villiegas
Gypsy's Mother
Elspeth Dudgeon
Dr. Septimus Pretorius
Ernst Thesiger
Auntie Glutz
Tempe Piggott
King
Monte Montague