Constance Bennett as Duchess of Florence

Fredric March as Benvenuto Cellini

Frank Morgan as Alessandro, Duke of Florence

Fay Wray as Angela

Vince Barnett as Ascanio

Jessie Ralph as Beatrice

Louis Calhern as Ottaviano

Jay Eaton as Polverino

Paul Harvey as Emissary

Jack Rutherford as Captain of the Guards

Irene Ware as Daughter of the Royal House of Bocci

Lucille Ball as Lady-in-Waiting (uncredited)

Bonnie Bannon as Girl (uncredited)

Lionel Belmore as Court Member (uncredited)

Ward Bond as Palace Guard Finding Cellini's Clothes (uncredited)

Lane Chandler as Jailer (uncredited)

James Flavin as Palace Guard (uncredited)

Bess Flowers as Lady-in-Waiting (uncredited)

Mary Lange as Lady-in-Waiting (uncredited)

Theodore Lorch as Executioner (uncredited)

Russ Powell as Servant (uncredited)

Dewey Robinson as Steward (uncredited)

Constantine Romanoff as Executioner (uncredited)

Harry Wilson as Henchman (uncredited)