With Nicolau Breyner, Jose Viana, Dagmar Bürger, Anton Diffring, Susan Hemingway, Ana Zanatti, Herbert Fux, Isa Schneider, Herman José, William Berger, Esther Studer, Patricia Da Silva, Vítor Mendes, Aida Vargas, Victor de Sousa
Love Letters of a Portuguese Nun is a 1977 West German-Swiss movie directed by Jess Franco. It tells the story of Maria, a girl in Inquisition-era Portugal, whom a priest sees cavorting with a boy. He orders her to become a nun as penance. In the convent Maria gets subjected to all sorts of torture and humiliation at the hands of the priest and the mother superior.
The movie is part of a genre known as "nunsploitation".