Lew Ayres
Dr. James Kildare
Lionel Barrymore
Dr. Leonard Gillespie
Laraine Day
Nurse Mary Lamont
Nat Pendleton
Joe Wayman
Lana Turner
Rosalie Lewett
Samuel S. Hinds
Dr. Stephen Kildare
Lynne Carver
Alice Raymond
Emma Dunn
Mrs. Martha Kildare
Walter Kingsford
Dr. Walter Carew
Alma Kruger
Molly Byrd
Harlan Briggs
James Galt
Henry Hunter
Harry Galt
Marie Blake
Sally
Phillip Terry
Bates
Roger Converse
Joiner
Don 'Red' Barry
Collins
Reed Hadley
Tom Crandell
Nell Craig
Nurse "Nosey" Parker
George Offerman, Jr.
Nick
Clinton Rosemond
Conover
Johnny Walsh
'Red'
Dorothy Adams
Jenny's Mother (uncredited)
Barbara Bedford
Dr. Carew's Secretary (uncredited)
Margaret Bert
Mrs. Benson - Tommy's Mother (uncredited)
George Chandler
Elevator Operator (uncredited)
Cliff Clark
Detective Flaherty (uncredited)
Elspeth Dudgeon
Old Lady in Hall (uncredited)
George Guhl
Policeman in Nick's Hospital Room (uncredited)
Robert Homans
Hickman - Policeman Bringing Jenny (uncredited)
Horace McMahon
Fog Horn - Taxi Driver (uncredited)
George Noisom
Special Delivery Boy (uncredited)
Frank Orth
Mike Sullivan - Hospital Cafe Owner (uncredited)
George Ovey
Man Telling Hickman to Put His Hat On (uncredited)
Aileen Pringle
Mrs. Thatcher (uncredited)
George H. Reed
Black Man with Stomach Trouble (uncredited)
Matty Roubert
Newsboy (uncredited)
Harry Seymour
Man in Galt's Office (uncredited)
Amzie Strickland
Patient (uncredited)
Ann E. Todd
Jenny (uncredited)
Dorothy Vaughan
Mother of Baby Vaughan (uncredited)
Bobs Watson
Tommy Benson (uncredited)