Barbara Steele

~ as ~

Helen Karnstein / Mary Karnstein

George Ardisson

~ as ~

Baron Kurt Hummel

Halina Zalewska

~ as ~

Elizabeth Hummel / Adele Karnstein

Umberto Raho

~ as ~

Von Klage

Laura Nucci

~ as ~

Grumalda

Giuliano Raffaelli

~ as ~

Count Humboldt

Nello Pazzafini

~ as ~

Monk

Jeffrey Darcey

~ as ~

The Messenger

Aldo Barozzi

~ as ~

Plague Victim (uncredited)

Mario Casella

~ as ~

Gorca (uncredited)