Lionel Barrymore as Dr. Leonard Gillespie

Lew Ayres as Dr. James Kildare

Lynne Carver as Alice Raymond

Nat Pendleton as Joe Wayman

Jo Ann Sayers as Barbara Chanler

Samuel S. Hinds as Dr. Stephen Kildare

Emma Dunn as Mrs. Martha Kildare

Walter Kingsford as Dr. P. Walter Carew

Truman Bradley as Jack Hamilton

Monty Woolley as Dr. Lane-Porteus

Pierre Watkin as Mr. Robert Chanler

Nella Walker as Mrs. Chanler

Murray Alper as Blue Swan Waiter (uncredited)

Don 'Red' Barry as Dr. Collins (uncredited)

Granville Bates as Harry Cook (uncredited)

Barbara Bedford as Nurse (uncredited)

Margaret Bert as Little Boy's Mother (uncredited)

Marie Blake as Miss Sally Green (uncredited)

Virginia Brissac as Boardinghouse Landlady (uncredited)

John Butler as Coronary Patient (uncredited)

Don Castle as Dr. Bates (uncredited)

Janice Chambers as Maggie (uncredited)

Roger Converse as Dr. Joiner (uncredited)

Nell Craig as Nurse Parker (uncredited)

Frank Dae as President, Board of Directors (uncredited)

Bess Flowers as Nurse (uncredited)

Brenda Fowler as Head Nurse (uncredited)

Harrison Greene as Bartender (uncredited)

Howard Hickman as Dr. Harris (uncredited)

Cy Kendall as Charlie (uncredited)

Mary MacLaren as Lodger Bringing Blanket (uncredited)

James Pier Mason as Lodger Going for Ambulance (uncredited)

Tom McGuire as Clancy (uncredited)

Jack Murphy as Intern (uncredited)

Frank Orth as Mike Ryan (uncredited)

Leonard Penn as Albert Foster (uncredited)

Cyril Ring as Intern (uncredited)

Clinton Rosemond as Conover (uncredited)

Gilbert Russell as Intern (uncredited)

Edwin Stanley as Resident Doctor (uncredited)

Phillip Terry as Dr. Vickery (uncredited)

Emmett Vogan as Detective Herman (uncredited)

Bobs Watson as Little Boy (uncredited)

Jack Woody as Ed (uncredited)

William Worthington as Board Member (uncredited)