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)