Chapter 27 is a 2007 biographical drama film depicting the murder of John Lennon by Mark David Chapman. It was written and directed by Jarrett Schaefer, based on the 1992 book Let Me Take You Down by Jack Jones, produced by Robert Salerno, and stars Jared Leto as Chapman. The film takes place in December 1980, and is intended to be an exploration of Chapman's psyche. Its title is a reference to J. D. Salinger's 1951 novel The Catcher in the Rye, which has 26 chapters, and suggests a continuation of the book.

On the evening of 8 December 1980, the English musician John Lennon, formerly of the Beatles, was shot and fatally wounded in the archway of the Dakota, his residence in New York City. The killer, Mark David Chapman, was an American Beatles fan who was jealous and enraged by Lennon's lifestyle, alongside his 1966 comment that the Beatles were "more popular than Jesus". Chapman said he was inspired by the fictional character Holden Caulfield from J. D. Salinger's novel The Catcher in the Rye, a "phony-killer" who loathes hypocrisy.