Dr. Martin Arrowsmith
Ronald Colman
Leora Tozer Arrowsmith
Helen Hayes
State Veterinarian
David Landau
Sir Robert Fairland
Lumsden Hare
Pioneer (uncredited)
Erville Alderson
Cop (uncredited)
Ward Bond
Mrs. Tozer (uncredited)
Beulah Bondi
Miss Twyford (uncredited)
Florence Britton
Nurse (uncredited)
Nora Cecil
Dr. Hesselink (uncredited)
Sidney De Gray
Committee Member (uncredited)
Cyril Delevanti
City Clerk (uncredited)
Walter Downing
Gustav Sondelius
Richard Bennett
Gibson Gowland
Reporter (uncredited)
Sherry Hall
Native Mother (uncredited)
Theresa Harris
Drunk (uncredited)
Raymond Hatton
Pioneer Girl (uncredited)
Charlotte Henry
Italian Uncle (uncredited)
George Humbert
B.W. Tozer (uncredited)
DeWitt Jennings
Mike Lally
West Indies Townswoman at Meeting (uncredited)
Lillian Lawrence
Ship's Passenger (uncredited)
Carl M. Leviness
Professor Max Gottlieb
A.E. Anson
Old Doctor (uncredited)
James A. Marcus
Dignitary at Luncheon (uncredited)
Eric Mayne
Little Johnny (uncredited)
Kendall McComas
Edmund Mortimer
Henry Novak (uncredited)
John Qualen
Dignitary (uncredited)
Edward Reinach
Intern (uncredited)
Milton Royce
Bartender (uncredited)
Harry Schultz
Ship's Officer (uncredited)
Pat Somerset
Mrs. Novak (uncredited)
Adele Watson
Dr. Oliver Marchand
Clarence Brooks
Little Neighbor (uncredited)
Bobby Watson
Eric Wilton
Twyford
Alec B. Francis
Dr. Tubbs
Claude King
Bert Tozer
Bert Roach
Joyce Lanyon
Myrna Loy
Terry Wickett
Russell Hopton
Novel
Sinclair Lewis
Presenter
Samuel Goldwyn
Producer
Director
John Ford
Music Director
Alfred Newman
Original Music Composer
Screenplay
Sidney Howard
Assistant Director
Herbert Sutch
Settings
Richard Day
Sound
Jack Noyes
Orchestrator
Ray Heindorf
Editor
Hugh Bennett
Casting
Robert McIntyre
Set Decoration
Director of Photography
Ray June
Executive Producer
Arthur Hornblow Jr.