Anita Ekberg as Sister Gertrude

Joe Dallesandro as Dr. Patrick Roland

Alida Valli as Mother Superior

Massimo Serato as Dr. Poirret

Daniele Dublino as Director

Paola Morra as Sister Mathieu

Lou Castel as Peter

Laura Nucci as Baroness

Alice Gherardi as Nurse

Lee De Barriault as

Ileana Fraia as Florence

Antonietta Patriarca as

Sofia Lusy as Janet

Nerina Montagnani as Josephine

Franco Caracciolo as Priest in Confessional

Maria Sofia Amendolea as

Chicca Thomas as

Manlio Pierotti as

Brunello Chiodetti as Sister Gertrude's Lover

Enzo Spitaleri as

Lesly Thomas as

Aldo De Franchi as

Carolyn De Fonseca as Sister Gertrude (voice) (uncredited)