Samuel Langhorne Clemens (Mark Twain)
Fredric March
Olivia Langdon Clemens
Alexis Smith
Dr. Quintard (uncredited)
Charles Waldron
Butler
Willie Best
Mrs. Langdon
Nana Bryant
Young Samuel Clemens
Dickie Jones
Toy Shop Clerk
Frank Darien
Ulysses S. Grant
Joseph Crehan
Audience Member (uncredited)
Hazel Dohlman
J.B. Pond
Donald Crisp
Steve Gillis
Alan Hale
Oxford Chancellor
C. Aubrey Smith
Bret Harte
John Carradine
Horace E. Bixby, Riverboat Captain
Robert Barrat
Jervis Langdon
Walter Hampden
Clara Clemens
Joyce Reynolds
Charles Langdon
William Henry
Executive Producer
Jack L. Warner
Original Music Composer
Max Steiner
Director
Irving Rapper
Producer
Jesse L. Lasky
Adaptation
Alan Le May
Screenplay
Editor
Ralph Dawson
Set Decoration
Fred M. MacLean
Director of Photography
Sol Polito
Art Direction
John Hughes
Special Effects
Paul Detlefsen