The Demons are major antagonists in The Amityville Horror film series and books. They are the first owners of the infamous Amityville house and will do anything to keep their home, by haunting the human owners of it of course.

The most notable demons include John Ketcham, the phantom ghosts of the DeFeo family; the most notorious are a gigantic, white-robed "monster" with its face blown off and "Jodie", an imaginary friend in the form of a demonic pig-like creature with spectral red eyes. Others include a variety of evil and unholy spirits.