Lew Ayres as Dr. James Kildare

Lionel Barrymore as Dr. Leonard Gillespie

Laraine Day as Nurse Mary Lamont

Bonita Granville as Frances Marlowe

Alma Kruger as Molly Byrd

Red Skelton as Vernon Briggs

Paul Stanton as Mr. Reynolds

Diana Lewis as Fay Lennox

Walter Kingsford as Dr. Walter Carew

Nell Craig as Nurse Parker

Tom Conway as Mr. Channing

Marie Blake as Sally

Eddie Acuff as Clifford Genet

George H. Reed as Conover (as George H. Reed)

Chick Chandler as Dan Morton

Frank Orth as Mike Ryan

Gladys Blake as Maisie

Bess Flowers as Nurse (uncredited)