- Bob Hope
- Pippo Popolino
- Joan Fontaine
- Francesca Bruni
- Audrey Dalton
- Donna Elena Di Gambetta
- Basil Rathbone
- Lucio / Narrator
- Hugh Marlowe
- Stefano Di Gambetta
- Arnold Moss
- The Doge
- John Carradine
- Minister Foressi
- John Hoyt
- Maggiorin
- Hope Emerson
- Duchess of Castelbello
- Robert Hutton
- Raphael, Duc of Castelbello
- Lon Chaney Jr.
- Emo the Murderer
- Raymond Burr
- Minister Bragadin
- Frieda Inescort
- Signora Di Gambetta
- Primo Carnera
- Corfa
- Frank Puglia
- Carabaccio
- Paul Cavanagh
- Signor Alberto Di Gambetta
- Romo Vincent
- Giovanni
- Henry Brandon
- Capt. Rugello
- Natalie Schafer
- Signora Foressi
- Douglas Fowley
- Second Prisoner
- Nestor Paiva
- Gnocchi
- Lucien Littlefield
- First Prisoner
- Eric Alden
- Maggiorin's Ruffian
- John Alderson
- Outside Guard
- Mary Bayless
- Minor Role
- Oliver Blake
- Amadeo
- Sue Casey
- Minor Role
- Charles Cooley
- Manservant
- Gino Corrado
- Ambassador
- Dulce Day
- Minor Role
- John Doucette
- Mounted Guard
- Dan Dowling
- Cloth Merchant
- Trippe Elan
- Small Boy
- Marla English
- Girl in Gondola
- Franklyn Farnum
- Guest
- Fritz Feld
- Baron Mittschalk of Cardovia
- Bess Flowers
- Marquesa
- Barbara Freking
- Maria
- Kathryn Grant
- Girl in Gondola
- Joe Gray
- Court Guard
- Chuck Hicks
- Assistant Headsman
- Arline Hunter
- Girl in Window
- Richard Karlan
- Outside Guard
- Walter Kingsford
- Minister
- Skelton Knaggs
- Little Man
- Edith Leslie
- (uncredited)
- Torben Meyer
- Attendant
- Paul Newlan
- Regniacci
- Vincent Price
- Casanova
- Keith Richards
- Servant
- Michael Ross
- Jailer
- Edna Ryan
- Minor Role
- Dick Sands
- Headsman
- Joan Shawlee
- Beatrice D'Brizzi
- Rexene Stevens
- Swimmer
- Joseph Vitale
- Guard on Steps
- Max Wagner
- Townsman
- Anthony Warde
- Gondolier
- Paul Wexler
- Tall Prisoner
