Lights Out is a 2016 American supernatural horror film directed by David F. Sandberg (in his directorial debut) and written by Eric Heisserer, who based the screenplay on Sandberg's 2013 short film of the same name. It follows a woman who must protect her young half-brother against a spirit from her family's past that kills its victims in the dark. The film stars Teresa Palmer, Gabriel Bateman, Alexander DiPersia, Billy Burke, and Maria Bello. It also features Sandberg's wife Lotta Losten, who starred in the short film.

Produced by Heisserer, Lawrence Grey, and James Wan, the film was shot in Los Angeles from June to August 2015. It had its world premiere at the Los Angeles Film Festival on June 8, 2016, and was released in the United States and Canada by Warner Bros. on July 22, 2016. The film grossed $148 million against a budget of $4.9 million and received praise from critics for its direction, screenplay, performances, cinematography, and score. A sequel is in development.