Elenco - O Segredo do Dr. Kildare
Lew Ayres
Dr. James Kildare
Lionel Barrymore
Dr. Leonard Gillespie
Lionel Atwill
Paul Messenger
Helen Gilbert
Nancy Messenger
Nat Pendleton
Joe Wayman
Laraine Day
Nurse Mary Lamont
Sara Haden
Nora
Samuel S. Hinds
Dr. Stephen Kildare
Emma Dunn
Mrs. Martha Kildare
Walter Kingsford
Dr. S.J. Carew
Grant Mitchell
John Xerxes Archley
Alma Kruger
Head Nurse Molly Byrd
Robert Kent
Charles Herron
Marie Blake
Sally - Telephone Operator
Martha O'Driscoll
Mrs. Roberts
Nell Craig
Nurse 'Nosey' Parker
George H. Reed
Conover
Frank Orth
Mike Sullivan
Walter Baldwin
Finch (uncredited)
Don 'Red' Barry
Collins - Intern (uncredited)
George Chandler
Pay Orderly (uncredited)
Tom Collins
Dr. Joiner (uncredited)
Alec Craig
Telephone Repair Man (uncredited)
Byron Foulger
Hospital Attendant (uncredited)
Mitchell Lewis
Adam - Nora's Gardener (uncredited)
Matt McHugh
Messenger's Chauffeur (uncredited)
Emory Parnell
Policeman on Gaylor Ave. (uncredited)
William Tannen
Bates - Intern (uncredited)
Joe Yule
Lunch Room Counterman (uncredited)