Lew Ayres as Dr. James Kildare

Lionel Barrymore as Dr. Leonard Gillespie

Laraine Day as Nurse Mary Lamont

Red Skelton as Vernon Briggs

Alma Kruger as Molly Byrd

Samuel S. Hinds as Dr. Stephen Kildare

Nils Asther as Constanzo Labardi

Walter Kingsford as Dr. Walter Carew

Emma Dunn as Mrs. Martha Kildare

Miles Mander as Dr. Lockberg

Connie Gilchrist as Jennie the Maid