Lew Ayres

Dr. James Kildare

Lionel Barrymore

Dr. Leonard Gillespie

Laraine Day

Nurse Mary Lamont

Samuel S. Hinds

Dr. Stephen Kildare

Gene Lockhart

George Winslow

John Shelton

Dr. Davidson

Nat Pendleton

Joe Wayman

Emma Dunn

Mrs. Martha Kildare

Alma Kruger

Molly Byrd

Walter Kingsford

Dr. Walter Carew

Nell Craig

Nurse Parker

Henry Wadsworth

Collins

Donald Briggs

Mr. Brownlee

Leona Maricle

Mrs. Brownlee

Archie Twitchell

Bates

Marie Blake

Sally

Charles Trowbridge

Atkinson

Arthur O'Connell

Intern (uncredited)

Eddie Acuff

Clifford Genet - an Orderly (uncredited)

Erville Alderson

Boylston - City Council Member (uncredited)