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

Nell Craig

Nurse Parker

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)

Barbara Bedford

Carew's Secretary (uncredited)

George Chandler

Parkersville Counterman (uncredited)

Ken Christy

Dickson - City Council Member (uncredited)

Ralph Dunn

Motorcycle Cop (uncredited)

Claire McDowell

Nurse for Mr. Winslow (uncredited)

Horace McMahon

Foghorn Murphy (uncredited)

Milton Parsons

Parkersville Crazy Man (uncredited)

Ferris Taylor

Dr. Coldridge (uncredited)