Monkey Business

Groucho Marx

Groucho

Harpo Marx

Harpo

Chico Marx

Chico

Zeppo Marx

Zeppo

Rockliffe Fellowes

J.J. 'Big Joe' Helton

Harry Woods

Alky Briggs

Thelma Todd

Lucille Briggs

Ruth Hall

Mary Helton

Tom Kennedy

Gibson

Ben Taggart

Capt. Corcoran (uncredited)

Billy Bletcher

Man in Deck Chair

Maurice Chevalier

Himself (voice)