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

George H. Reed

Conover

Frank Orth

Mike Sullivan

Walter Baldwin

Finch (uncredited)

Don 'Red' Barry

Collins - Intern (uncredited)

George Chandler

Pay Orderly (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)