The Monster (as Karloff)

Boris Karloff

Henry Frankenstein

Colin Clive

Mary Wollstonecraft Shelley/The Monster's Mate

Elsa Lanchester

Elizabeth Frankenstein

Valerie Hobson

Lord Byron

Gavin Gordon

Doctor Pretorius

Ernest Thesiger

Hermit

O.P. Heggie

Percy Shelley

Douglas Walton

Minnie

Una O'Connor

Burgermeister

E.E. Clive

Albert (the butler)

Lucien Prival

Burgomaster

E. E. Clive

Karl

Dwight Frye

Hans

Reginald Barlow

Hans' wife

Mary Gordon

Shepherdess

Anne Darling

Ludwig

Ted Billings

Priest

Lucio Villegas

Coroner

Edwin Mordant

Woman

Grace Cunard

Woman

Helen Gibson

Miniature King

Arthur S. Byron

Miniature Queen

Joan Woodbury

Miniature Archbishop

Norman Ainsley

Miniature Devil

Peter Shaw

Miniature Baby (uncredited)

Billy Barty

Miniature Ballerina

Kansas DeForrest

Miniature Mermaid

Josephine McKim

Communion Girl

Helen Parrish

Hunter

Robert A'Dair

Hunter

Frank Terry

Mother

Brenda Fowler

Neighbor

Walter Brennan

Neighbor

Rollo Lloyd

Neighbor

Mary Stewart

Uncle Glutz

Gunnis Davis

Aunt Glutz

Tempe Pigott

Hunter at Hermit's Hut

John Carradine

Hunter at Hermit's Hut

Jack Curtis

Rudy, Second Graverobber

Neil Fitzgerald

Marta

Sarah Schwartz

Villager

Edward Peil Sr.

Villager

Frank Benson

Villager

Anders Van Haden

Villager

John George

A Hunter

Robert Adair

Gypsy

Maurice Black

King

A.S. 'Pop' Byron

Procession Leader

D'Arcy Corrigan

Uncle Glutz

J. Gunnis Davis

Gypsy's Mother

Elspeth Dudgeon

Gypsy's Wife

Helen Jerome Eddy

Girl

Marilyn Harris

Man Being Strangled By the Monster in Flashback During Prolo

Torben Meyer

Dr. Septimus Pretorius

Ernst Thesiger

Auntie Glutz

Tempe Piggott

King

Monte Montague