Valerie Hobson
as Elizabeth Frankenstein
Boris Karloff
as The Monster (as Karloff)
Elsa Lanchester
as Mary Wollstonecraft Shelley/The Monster's Mate
Colin Clive
as Dr. Henry Frankenstein
O.P. Heggie
as Hermit
Una O'Connor
as Minnie
Ernest Thesiger
as Dr. Pretorius
Gavin Gordon
as Lord Byron
Douglas Walton
as Percy Shelley
E.E. Clive
as Burgermeister
Lucien Prival
as Albert (the butler)
Dwight Frye
as Karl
Reginald Barlow
as Hans
Mary Gordon
as Hans' wife
Anne Darling
as Shepherdess