Una notte all'opera

Groucho Marx

Otis B. Driftwood

Chico Marx

Fiorello

Harpo Marx

Tomasso

Kitty Carlisle

Rosa

Allan Jones

Ricardo Barroni

Sig Ruman

Gottlieb

Walter Woolf King

Lassparri

Robert Emmett O'Connor

Henderson

Margaret Dumont

Mrs. Claypool

Edward Keane

Captain

Evelyn Selbie

The Fortune Teller in 'Trovatore' (uncredited)

Purnell Pratt

The Mayor of New York (uncredited)

Jonathan Hale

The Stage Manager (uncredited)

Otto Fries

Otto the Elevator Operator (uncredited)

Gino Corrado

First Porter (uncredited)