Believe it or not this is nowhere near a complete list. As of 12/3/2022 there are 71 titles listed on IMDB with “Amityville” in the title.
The Amityville Horror (1979)
Amityville II: The Possession (1982)
Amityville 3D (1983)
Amityville 4: The Evil Escapes (1989)
The Amityville Curse (1990)
Amityville: It’s About Time (1992)
Amityville: A New Generation (1993)
Amityville Dollhouse (1996)
The Amityville Horror (2005)
The Amityville Haunting (2011)
The Amityville Asylum (2013)
The Amityville Playhouse (2013)
Amityville Death House (2015)
Amityville: Vanishing Point (2016)
The Amityville Legacy (2016)
The Amityville Terror (2016)
Amityville: No Escape (2016)
Amityville: Evil Never Dies (2017)
Amityville Exorcism (2017)
Amityville: The Awakening (2017)
Amityville: Mt. Misery Road
The Amityville Murders (2018)
Amityville Island (2020)
Amityville Vibrator (2020)
Witches of Amityville Academy (2020)
The Amityville Harvest (2020)
An Amityville Poltergiest (2021)
The Amityville Moon (2021)
Amityville Cult (2021)
Amityville In the Hood (2021)
Amityville Vampire (2021)
Amityville Scarecrow (2022)
Amityville In Space (2022)
Projects in Production
Again, not a full list. I just included the ones that looked interesting to me. I left off Amityville Anaconda.
High Hopes: The Amityville Series: 15 years after brutal murders occured in Amityville Long Island, the killer is wanting freedom.
Amityville: The Beginning: A TRUE prequel to the Amityville Horror.
The Amityville Curse: A reboot of the 1990 film based on the book by Hans Holzer.
Return to Amityville: A popular journalist finds himself in deep water when he visits the town of Amityville.
AMITYVILLE REBORN 