Barbara Steele

Helen Karnstein / Mary Karnstein

George Ardisson

Baron Kurt Hummel

Halina Zalewska

Elizabeth Hummel / Adele Karnstein

Umberto Raho

Von Klage

Laura Nucci

Grumalda

Giuliano Raffaelli

Count Humboldt

Nello Pazzafini

Monk

Aldo Barozzi

Plague Victim (uncredited)

Alba Maiolini

Wife of Plague Victim (uncredited)

Aldo Massasso

The Priest (uncredited)