Amityville 3-D (also known as Amityville III: The Demon) is a 1983 supernatural horror film directed by Richard Fleischer and starring Tony Roberts, Tess Harper, Robert Joy, Candy Clark, Lori Loughlin and Meg Ryan. It is the third film based in the Amityville Horror series, it was written by William Wales, a pseudonym for David Ambrose. It was one of a spate of 3-D films released in the early 1980s, and was the only Orion Pictures film filmed in the format. It is an international co-production between the United States and Mexico.

Due to a lawsuit between the Lutz family and Dino De Laurentiis over the storyline (which did not involve the Lutz family), Amityville 3-D was not initially promoted as a sequel, and the name Lutz is never used in the film. However, the film does make a reference to the original Amityville Horror story. The character of John Baxter (Roberts) is loosely based on Stephen Kaplan, who was trying to prove the Lutzes' story was a hoax at the time. It was panned upon release.