Duck Soup

Groucho Marx

Rufus T. Firefly

Harpo Marx

Pinky

Chico Marx

Chicolini

Zeppo Marx

Bob Roland

Margaret Dumont

Gloria Teasdale

Raquel Torres

Vera Marcal

Louis Calhern

Ambassador Trentino

Edmund Breese

Zander

Leonid Kinskey

Sylvanian Agitator

Charles Middleton

Prosecutor

Edgar Kennedy

Street Vendor

Edward Arnold

Politician (uncredited)

Wade Boteler

Officer at Battle Headquarters (uncredited)

Sidney Bracey

Mrs. Teasdale's Butler (uncredited)

E.H. Calvert

Officer in Battle Sequence (uncredited)

Davison Clark

Minister of Finance #2 (uncredited)