Helen Hayes

Catherine Barkley

Gary Cooper

Lt. Frederic Henry

Adolphe Menjou

Major Rinaldi

Mary Philips

Helen Ferguson

Jack La Rue

Priest

Blanche Friderici

Head Nurse

Mary Forbes

Miss Van Campen

Gilbert Emery

British Major

Henry Armetta

Bonello the Ambulance Driver (uncredited)

Herman Bing

Swiss Postal Clerk (uncredited)

Agostino Borgato

Hospital Porter Giulio (uncredited)

Marcelle Corday

Swiss Nurse (uncredited)

Gino Corrado

Italian Soldier (uncredited)

William Irving

Frustrated Opera Singing Friend (uncredited)

Doris Lloyd

Nurse (uncredited)