- HD 1080
- Runtime: 81m.
- Status: Released
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- Languages: it
- Country: Italy
- Director: Leopoldo Savona
- Stars: Mark Damon, Claudia Gravy, Aldo Bufi Landi, Fernando Cerulli, Silvana Pompili
- keywords: possession, murder, incest
- Production_studio: Agata Film
- Slogan: A boy is blinded with incestuous passion.
- providers: Troma NOW
- The Byleth: The Demon of Incest is featured in the top rankings of 1972
- #80 in Top Horror Movies of 1972
A young man becomes obsessed with Byleth, the demon of incest, and it leads to an unhealthy infatuation with his sister.