- HD 1080
- Runtime: 85m.
- Status: Released
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- Languages: de
- Country: Germany, Switzerland
- Director: Jesús Franco
- Stars: Susan Hemingway, Ana Zanatti, William Berger, Herbert Fux, Vítor Mendes
- keywords: nun, inquisition, satanism, letter, convent (nunnery), erotic movie, nunsploitation
- Production_studio: Ascot Film, Elite Film, Cinemec Zweite Produktions KG
- Slogan: Satanic lust behind cloister walls...
- providers: FlixFling
- The Love Letters of a Portuguese Nun is featured in the top rankings of 1977
- #29 in Top Horror Movies of 1977
16-year-old Maria is forced into Serra D'Aires convent, secretly run by Satanists.