Lew Ayres as Dr. James Kildare

Lionel Barrymore as Dr. Leonard Gillespie

Laraine Day as Nurse Mary Lamont

Robert Young as Douglas Lamont

Nat Pendleton as Joe Wayman

Walter Kingsford as Dr. Walter Carew

Alma Kruger as Molly Byrd

Bobs Watson as Tommy, the Crippled Child

Nell Craig as Nurse 'Nosey' Parker

George H. Reed as Conover

Frank Orth as Mike Ryan, Cafe Owner

Marie Blake as Sally, Hospital Receptionist

Horace McMahon as Foghorn Murphy

Eddie Acuff as Clifford Genet, Window Cleaner

Ernie Alexander as Assistant Bed Salesman

Charles Arnt as Mr. Stubbins, Man with Pain

Gladys Blake as Maisie, Emergency Switchboard Operator

Tom Collins as Doctor

Mimi Doyle as Edith

Byron Foulger as Orderly at Emergency Switchboard

William Haade as Guirk, Man in Fistfight

Milton Kibbee as Patient with Hand Injury

Cathy Lewis as Flo

David Newell as Chandler's Secretary

Lillian Rich as Nurse in Lobby

Fred Santley as Head Bed Salesman

Syd Saylor as Hospital Elevator Operator

Gus Schilling as Orderly Cleaning Window

Frank Sully as John Root

Bryant Washburn Jr. as Doctor

Pierre Watkin as Mr. Robert Chandler