Dr. Martin Arrowsmith

Ronald Colman

Leora Tozer Arrowsmith

Helen Hayes

Gustav Sondelius

Richard Bennett

Professor Max Gottlieb

A.E. Anson

Dr. Oliver Marchand

Clarence Brooks

Twyford

Alec B. Francis

Dr. Tubbs

Claude King

Bert Tozer

Bert Roach

Mrs. Tozer (uncredited)

Beulah Bondi

Twyford

Alec Francis

Mrs. Joyce Lanyon

Myrna Loy

Terry Wickett

Russell Hopton

Mr. Tozer

DeWitt Jennings

Henry Novak (uncredited)

John Qualen

Mrs. Novak (uncredited)

Adele Watson

State Veterinarian

David Landau

Sir Robert Fairland

Lumsden Hare

Pioneer (uncredited)

Erville Alderson

Cop (uncredited)

Ward Bond

The Pioneer Girl (uncredited)

Charlotte Henry

City Clerk (uncredited)

Walter Downing

Miss Twyford (uncredited)

Florence Britton

Nurse (uncredited)

Nora Cecil

Old Doctor

James Marcus

Dr. Hesselink (uncredited)

Sidney De Gray

Committee Member (uncredited)

Cyril Delevanti

Doctor Hesselink

Sidney de Grey

Committee Member (uncredited)

Gibson Gowland

Reporter (uncredited)

Sherry Hall

Drunk (uncredited)

Raymond Hatton

Little Neighbor (uncredited)

Bobby Watson

Native Mother (uncredited)

Theresa Harris

Italian Uncle (uncredited)

George Humbert

Reporter (uncredited)

Mike Lally

West Indies Townswoman at Meeting (uncredited)

Lillian Lawrence

Ship's Passenger (uncredited)

Carl M. Leviness

Dignitary at Luncheon (uncredited)

Eric Mayne

Little Johnny (uncredited)

Kendall McComas

Ship's Passenger (uncredited)

Edmund Mortimer

Dignitary (uncredited)

Edward Reinach

Intern (uncredited)

Milton Royce

Bartender (uncredited)

Harry Schultz

Ship's Officer (uncredited)

Pat Somerset

Ship's Officer (uncredited)

Eric Wilton