Annette Stroyberg as Carmilla

Mel Ferrer as Leopoldo De Karnstein

Elsa Martinelli as Georgia Monteverdi

Alberto Bonucci as Carlo Ruggieri

René-Jean Chauffard as Dr. Verari

Gabriella Farinon as Lisa

Serge Marquand as Giuseppe

Edith Peters as The Cook

Nathalie Lafaurie as Marie

Carmilla Stroyberg as Martha

Marc Allégret as Judge Monteverdi

Renato Speziali as Guido Naldi (uncredited)

Giovanni Di Benedetto as Police Marshal (uncredited)

Roger Vadim as Passenger in the Plane (uncredited)