Paulette Goddard
Lucretia Borgia
John Lund
Alfonso D'Este
Macdonald Carey
Cesare Borgia
Albert Dekker
Vanetti
John Sutton
Prince Bisceglie
Raymond Burr
Michelotto
Donald Randolph
Tiziano
Charles Dayton
Bastino
Anthony Caruso
Captain of the Guard
Dick Foote
Negligent Sentry
William Farnum
Conti Peruzzi
Kate Drain Lawson
Gemma
Nicholas Joy
Chamberlain
Fritz Leiber
Filippo
Rose Hobart
Lady Eleanora
Douglas Spencer
False Physician
Nestor Paiva
Mayor
Frank Puglia
Bolfi
Houseley Stevenson
Councillor
Robert Greig
Councillor
Don Beddoe
Councillor
Ian Wolfe
Councillor (uncredited)