Dr. Martin Arrowsmith

Leora Tozer Arrowsmith

Gustav Sondelius

Professor Max Gottlieb

Dr. Oliver Marchand

Twyford

Dr. Tubbs

Bert Tozer

Joyce Lanyon

Terry Wickett

State Veterinarian

Sir Robert Fairland

Pioneer (uncredited)

Cop (uncredited)

Mrs. Tozer (uncredited)

Miss Twyford (uncredited)

Nurse (uncredited)

Dr. Hesselink (uncredited)

Committee Member (uncredited)

City Clerk (uncredited)

Committee Member (uncredited)

Reporter (uncredited)

Native Mother (uncredited)

Drunk (uncredited)

Pioneer Girl (uncredited)

Italian Uncle (uncredited)

B.W. Tozer (uncredited)

Reporter (uncredited)

West Indies Townswoman at Meeting (uncredited)

Ship's Passenger (uncredited)

Old Doctor (uncredited)

Dignitary at Luncheon (uncredited)

Little Johnny (uncredited)

Ship's Passenger (uncredited)

Henry Novak (uncredited)

Dignitary (uncredited)

Intern (uncredited)

Bartender (uncredited)

Ship's Officer (uncredited)

Mrs. Novak (uncredited)

Little Neighbor (uncredited)

Ship's Officer (uncredited)