12-year-old Regan MacNeil begins to adapt an explicit new personality as strange events befall the local area of Georgetown. Her mother becomes torn between science and superstition in a desperate bid to save her daughter, and ultimately turns to her last hope: Father Damien Karras, a troubled priest who is struggling with his own faith.
- Year: 1973
- Country: United States of America
- Genre: Horror
- Studio: Hoya Productions, Warner Bros. Pictures
- Keyword: exorcism, holy water, religion and supernatural, vomit, possession, priest, ouija board, satan, paranormal phenomena, demon, strong language, catholic church, demonic possession, disturbed child, crisis of faith, sfx, supernatural horror
- Director: William Friedkin
- Cast: Ellen Burstyn, Linda Blair, Jason Miller, Max von Sydow, Lee J. Cobb, Kitty Winn