Regan Teresa MacNeil (born April 7, 1959) is a fictional character from William Peter Blatty's horror novel and film adaptation The Exorcist as a supporting character and its first sequel, Exorcist II: The Heretic, and the sequel television series The Exorcist as one of the main protagonists in season one. She was portrayed by Linda Blair in both films and by Geena Davis in the television series.
