Young Dr. Kildare

Lionel Barrymore

Dr. Leonard Gillespie

Lew Ayres

Dr. James Kildare

Lynne Carver

Alice Raymond

Nat Pendleton

Joe Wayman

Jo Ann Sayers

Barbara Chanler

Samuel S. Hinds

Dr. Stephen Kildare

Emma Dunn

Mrs. Martha Kildare

Walter Kingsford

Dr. P. Walter Carew

Truman Bradley

Jack Hamilton

Monty Woolley

Dr. Lane-Porteus

Pierre Watkin

Mr. Robert Chanler

Nella Walker

Mrs. Chanler

Murray Alper

Blue Swan Waiter (uncredited)

Don 'Red' Barry

Dr. Collins (uncredited)

Granville Bates

Harry Cook (uncredited)

Barbara Bedford

Nurse (uncredited)

Margaret Bert

Little Boy's Mother (uncredited)

Marie Blake

Miss Sally Green (uncredited)

Virginia Brissac

Boardinghouse Landlady (uncredited)

John Butler

Coronary Patient (uncredited)

Don Castle

Dr. Bates (uncredited)

Janice Chambers

Maggie (uncredited)

Roger Converse

Dr. Joiner (uncredited)

Nell Craig

Nurse Parker (uncredited)

Frank Dae

President, Board of Directors (uncredited)

Bess Flowers

Nurse (uncredited)

Brenda Fowler

Head Nurse (uncredited)

Harrison Greene

Bartender (uncredited)

Howard Hickman

Dr. Harris (uncredited)

Cy Kendall

Charlie (uncredited)

Mary MacLaren

Lodger Bringing Blanket (uncredited)

James Pier Mason

Lodger Going for Ambulance (uncredited)

Tom McGuire

Clancy (uncredited)

Jack Murphy

Intern (uncredited)

Frank Orth

Mike Ryan (uncredited)

Leonard Penn

Albert Foster (uncredited)

Cyril Ring

Intern (uncredited)

Clinton Rosemond

Conover (uncredited)

Gilbert Russell

Intern (uncredited)

Edwin Stanley

Resident Doctor (uncredited)