- Groucho Marx
- Otis B. Driftwood
- Chico Marx
- Fiorello
- Harpo Marx
- Tomasso
- Kitty Carlisle
- Rosa Castaldi
- Allan Jones
- Riccardo Barone
- Walter Woolf King
- Rudolfo Lassparri
- Sig Ruman
- Herman Gottlieb
- Margaret Dumont
- Mrs. Claypool
- Edward Keane
- Ship's Captain
- Robert Emmett O'Connor
- Police Sergeant Henderson
- Enrique Acosta
- Nightclub Guest
- Harry Adams
- Opera Spectator
- Harry Allen
- Doorman
- Sam Appel
- Dungeon Guard
- King Baggot
- Dignitary
- Marion Bell
- Lady looking for 'Aunt Minnie'
- Edna Bennett
- Maid
- Dolly Blackburn
- Little Girl watching Harpo playing
- Stanley Blystone
- Ship's Officer
- William A. Boardway
- Backstage Guest
- Paul Bradley
- Man on Dock
- Al Bridge
- Immigration Inspector
- Loie Bridge
- Ship Passenger
- Lorraine Bridges
- Louisa
- Ettore Campana
- Bit in 'I Pagliacci'
- Nina Campana
- Bit in 'I Pagliacci'
- Jack Chefe
- Opera Spectator
- Ruth Cherrington
- Opera Spectator
- Alex Chivra
- Shipboard Cook
- Martin Cichy
- Policeman
- Gino Corrado
- First Porter
- Gennaro Curci
- Doorman
- Sidney D'Albrook
- Stagehand
- Olga Dane
- Azucena in "Il Trovatore"
- Bill Days
- Singer in Chorus
- Gloria Delson
- Child
- Mario Dominici
- Ship Passenger
- Mike Donovan
- Policeman
- Jay Eaton
- Aviator
- Manuel Emanuel
- Bit in 'I Pagliacci'
- Fanchon
- Dancer
- Adolph Faylauer
- Opera Spectator
- Tom Ferrandini
- Opera Spectator
- Antonio Filauri
- Bit in 'I Pagliacci'
- Harry Fleischmann
- Policeman
- Bess Flowers
- Ship Passenger
- Otto Fries
- Otto - Elevator Operator
- Bud Geary
- Stagehand
- Alexander Giglio
- Bit in 'I Pagliacci'
- Billy Gilbert
- Orchestra Member Asking Fiorello Not to Play Piano
- William Gould
- Police Captain
- Helen Grayco
- Girl watching Chico play Piano
- Julia Griffith
- Opera Spectator
- George Guhl
- Policeman
- Jonathan Hale
- Stage Manager in Opera Box Who Announces Gottlieb's Disappearance
- Ben Hall
- Stagehand
- Chuck Hamilton
- Policeman
- Eddie Hart
- Policeman
- Oscar 'Dutch' Hendrian
- Stagehand
- Lew Hicks
- Policeman
- Luther Hoobyar
- Ruiz
- Art Howard
- Opera Spectator
- Rodolfo Hoyos
- Count di Luna
- George Irving
- Committeeman
- Selmer Jackson
- Committeeman
- Gwen Lee
- Driftwood's Dining Companion
- Jack 'Tiny' Lipson
- Engineer's Assistant
- Wilbur Mack
- Committeeman
- Tandy MacKenzie
- Tenor in 'Di quella pira'
- Tom Mahoney
- Police Sergeant
- Fred Malatesta
- Stagehand
- Jerry Mandy
- Second Porter
- Marco
- Dancer
- Alphonse Martell
- Ship Officer / Opera Spectator (uncredited)
- Francisco Marán
- Opera Doorman
- Charles McAvoy
- Policeman
- Tom McGuire
- Policeman
- Frank McLure
- Manager's Assistant
- Edmund Mortimer
- Dignitary
- James C. Morton
- Opera Spectator
- George Nardelli
- Ship Passenger
- Field Norton
- Manager's Assistant
- Alex Novinsky
- Ship Passenger
- Wedgwood Nowell
- Ship Passenger
- Gene O'Brien
- Piano scene with Harpo
- William H. O'Brien
- Stagehand
- William J. O'Brien
- Opera Spectator
- Inez Palange
- Maid
- Claude Payton
- Police Captain
- Lee Phelps
- Policeman at opera
- Alexander Pollard
- Committee Man
- Russ Powell
- Carriage Driver
- Purnell Pratt
- Mayor
- Hal Price
- Stagehand
- Rita
- Dancer
- Ronald R. Rondell
- Opera Spectator
- Milton Royce
- Ship Passenger / Opera Spectator (uncredited)
- Rubin
- Dancer
- Annette Ruderman
- Girl in Ballroom
- Alexander Schoenberg
- Violinist in Orchestra
- Earl Seaman
- Undetermined Role
- Scott Seaton
- Backstage Guest
- Rolfe Sedan
- Aviator
- Evelyn Selbie
- Fortune Teller
- Bruce Sidney
- Ship Passenger / Opera Spectator (uncredited)
- Phillips Smalley
- Committeeman
- Stephen Soldi
- Ship's Steward
- John St. Polis
- Opera Conductor
- Count Stefenelli
- Man at Launch
- Leo Sulky
- Policeman
- Ludovico Tomarchio
- Bit in 'I Pagliacci'
- Harry Tyler
- Sign Painter
- Ellinor Vanderveer
- Shipboard Dinner Party Guest / Opera Spectator (uncredited)
- Harry 'Zoup' Welsh
- Ship's Steward
- Leo White
- Aviator
- James J. Wolf
- Ferrando in 'Il Trovatore'
- Frank Yaconelli
- Engineer
