Lew Ayres
Role: Dr. James Kildare
Lionel Barrymore
Role: Dr. Leonard Gillespie
Laraine Day
Role: Nurse Mary Lamont
Samuel S. Hinds
Role: Dr. Stephen Kildare
Gene Lockhart
Role: George Winslow
John Shelton
Role: Dr. Davidson
Nat Pendleton
Role: Joe Wayman
Emma Dunn
Role: Mrs. Martha Kildare
Alma Kruger
Role: Molly Byrd
Walter Kingsford
Role: Dr. Walter Carew
Nell Craig
Role: Nurse Parker
Cliff Danielson
Role: Dr. Jordan
Henry Wadsworth
Role: Collins
George H. Reed
Role: Conover
Donald Briggs
Role: Mr. Brownlee
Leona Maricle
Role: Mrs. Brownlee
Archie Twitchell
Role: Bates
Charles Trowbridge
Role: Atkinson
Arthur O'Connell
Role: Intern (uncredited)
Eddie Acuff
Role: Clifford Genet - an Orderly (uncredited)
Erville Alderson
Role: Boylston - City Council Member (uncredited)
Arthur Aylesworth
Role: Mr. Cobb - a Farmer (uncredited)
Barbara Bedford
Role: Carew's Secretary (uncredited)
Jack Carr
Role: Dr. Marsh (uncredited)
Mary Cecil
Role: Mrs. Deering (uncredited)
George Chandler
Role: Parkersville Counterman (uncredited)
Ken Christy
Role: Dickson - City Council Member (uncredited)
Jane Drummond
Role: Nurse Probationer (uncredited)
Ralph Dunn
Role: Motorcycle Cop (uncredited)
Bob Ingersoll
Role: Carpenter Adding Sign on Door (uncredited)
Claire McDowell
Role: Nurse for Mr. Winslow (uncredited)
Horace McMahon
Role: Foghorn Murphy (uncredited)
Frank Orth
Role: Mike Ryan (uncredited)
Milton Parsons
Role: Parkersville Crazy Man (uncredited)
Ruth Robinson
Role: Mother of Baby (uncredited)
Ferris Taylor
Role: Dr. Coldridge (uncredited)
Kay Vallon
Role: Nurse Shaw (uncredited)