 | Constance Bennett als Duchess of Florence |
 | Fredric March als Benvenuto Cellini |
 | Frank Morgan als Alessandro, Duke of Florence |
 | Fay Wray als Angela |
 | Vince Barnett als Ascanio |
 | Jessie Ralph als Beatrice |
 | Louis Calhern als Ottaviano |
 | Jay Eaton als Polverino |
 | Paul Harvey als Emissary |
 | Jack Rutherford als Captain of the Guards |
 | Irene Ware als Daughter of the Royal House of Bocci |
 | Lucille Ball als Lady-in-Waiting (uncredited) |
 | Bonnie Bannon als Girl (uncredited) |
 | Lionel Belmore als Court Member (uncredited) |
 | Ward Bond als Palace Guard Finding Cellini's Clothes (uncredited) |
 | Lane Chandler als Jailer (uncredited) |
 | James Flavin als Palace Guard (uncredited) |
 | Bess Flowers als Lady-in-Waiting (uncredited) |
 | Mary Lange als Lady-in-Waiting (uncredited) |
 | Theodore Lorch als Executioner (uncredited) |
| Russ Powell als Servant (uncredited) |
 | Dewey Robinson als Steward (uncredited) |
 | Constantine Romanoff als Executioner (uncredited) |
 | Harry Wilson als Henchman (uncredited) |
| Gwen Wakeling | Costume Design |
| Richard Day | Art Direction |
| Gregory La Cava | Director |
| Bess Meredyth | Screenplay |
| Charles Rosher | Director of Photography |
| Darryl F. Zanuck | Producer |
| Barbara McLean | Editor |
| Fred Fox | Assistant Director |
| Alfred Newman | Original Music Composer |
| Fred De Gresac | Adaptation |
| Edwin Justus Mayer | Theatre Play |
| William Goetz | Associate Producer |
| Raymond Griffith | Associate Producer |
| Roy Clark | Camera Operator |
| Clarence Hewitt | Still Photographer |
| William A. Reinhart | Assistant Camera |
| Roy Tripp | Camera Operator |
| Adolph Bolm | Other |
| Joseph M. Schenck | Presenter |
