Boris Karloff

The Monster

Colin Clive

Henry Frankenstein

Valerie Hobson

Elizabeth

Ernest Thesiger

Doctor Pretorius

Elsa Lanchester

Mary Wollstonecraft Shelley / The Monster's Mate

Gavin Gordon

Lord Byron

Douglas Walton

Percy Bysshe Shelley

Una O'Connor

Minnie

E. E. Clive

Burgomaster

Lucien Prival

Butler

O. P. Heggie

Hermit

Dwight Frye

Karl

Reginald Barlow

Hans

Mary Gordon

Hans' Wife

Anne Darling

Shepherdess

Ted Billings

Ludwig

Billy Barty

Baby (uncredited)

Robert Adair

Hunter in Woods (uncredited)

Maurice Black

Gypsy (uncredited)

Walter Brennan

Peasant (uncredited)

John Carradine

Lost Hunter at Hermit's Cottage (uncredited)

D'Arcy Corrigan

Procession Leader (uncredited)

Grace Cunard

Villager (uncredited)

Elspeth Dudgeon

Gypsy's Mother (uncredited)

Helen Jerome Eddy

Gypsy's Wife (uncredited)

Brenda Fowler

Mother (uncredited)

John George

Villager (uncredited)

Helen Gibson

Villager (uncredited)

Marilyn Harris

Girl (uncredited)

Carmencita Johnson

Friend of Murdered Girl (uncredited)

Rollo Lloyd

Neighbor (uncredited)

Murdock MacQuarrie

Sympathetic Villager (uncredited)

Torben Meyer

Victim in flashback (uncredited)

Edwin Mordant

Coroner (uncredited)

Charles Murphy

Guard (uncredited)

Helen Parrish

Communion Girl (uncredited)

Edward Peil Sr.

Villager (uncredited)

Tempe Pigott

Auntie Glutz (uncredited)

Mary Stewart

Neighbor (uncredited)

Frank Terry

Lost Hunter at Hermit's Cottage (uncredited)

Dorothy Vernon

Maid (uncredited)

Joan Woodbury

Queen Homunculus (uncredited)