•
Lew Ayres as
Dr. Kildare •
Lionel Barrymore as Dr. Leonard Gillespie •
Ann Ayars as Cynthia Cookie Charles •
Robert Sterling as Dr. Donald Withrop •
Jean Rogers as Ms Annabelle Kirkie •
Alma Kruger as Nurse Molly Byrd •
Walter Kingsford as Dr. Walter Carew •
Nell Craig as Nurse Parker •
Edward Gargan as Orderly Willie Brooks •
Marie Blake as Sally, Switchboard Operator •
Frank Orth as Michael 'Mike' Ryan •
George Reed as Conover (as George H. Reed) •
Barry Nelson as Samuel Z. Cutter •
Eddie Acuff as Orderly Clifford Genet •
Gus Schilling as Orderly Leo Cobb • Stuart Crawford as Arnold Spencer •
William Bakewell as Mr. Hubble •
Charlotte Wynters as Mrs. Hubble •
Mary Field as Ms. Nixon (uncredited) •
Ray Walker as Taxi Driver with Injured Man (uncredited) ==Production==