Lights Out is a 2016 American supernatural horror film directed by David F. Sandberg in his directorial debut, produced by Lawrence Grey, James Wan, and Eric Heisserer and written by Heisserer. It stars Teresa Palmer, Gabriel Bateman, Alexander DiPersia, Billy Burke, and Maria Bello. It is based on Sandberg's 2013 short film of the same name and features Lotta Losten, who starred in the short.

In the film, when a terrifying force arises from her family's past, a woman must protect her young half-brother from a spirit that kills its victims in the dark. After the short film's success, Sandberg announced a feature film adaptation based on his short film. Principal photography for the film began in June 2015 in Los Angeles. Filming was completed on August 5, 2015.

The film had its world premiere at the Los Angeles Film Festival on June 8, 2016, and was released in the United States and Canada on July 22, 2016, by Warner Bros. The film received positive reviews from critics, with many praising the direction, screenplay, acting, cinematography and musical score, and grossed $148 million against a budget of $4.9 million. A sequel is in development.