Chapter 27 is a 2007 American independent film depicting the murder of John Lennon by Mark David Chapman, starring Jared Leto. It was written and directed by J. P. Schaefer. The film premiered at the Sundance Film Festival in January 2007 and the Berlin Film Festival in February. It received generally mixed reviews, although it did receive positive notices in Salon, The Hollywood Reporter, and Entertainment Weekly.

The film initially failed to land a U.S. distributor. The film was leaked onto the internet on March 23, 2007. The film saw US theatrical release in March 2008 and won the Debut Feature Prize award for Schaefer at the Zurich Film Festival. The film was finally released on March 28, 2008 according to Entertainment Weekly's 2008 Spring film preview for Chapter 27.

The similar film The Killing of John Lennon was released the previous year, produced in the United Kingdom, and dealt more extensively with Chapman's life prior to the shooting than did Chapter 27.