Jack the Giant Slayer (previously titled Jack the Giant Killer) is a 2013 American fantasy adventure film directed by Bryan Singer and written by Darren Lemke, Christopher McQuarrie and Dan Studney, from a story by Lemke and David Dobkin. The film, based on the British fairy tales "Jack the Giant Killer" and "Jack and the Beanstalk", stars Nicholas Hoult, Eleanor Tomlinson, Stanley Tucci, Ian McShane, Bill Nighy, Eddie Marsan and Ewan McGregor. The film tells the story of Jack, a young farmhand who must save an abducted princess from a race of giants after accidentally opening a gateway to their land in the sky.

Development of Jack the Giant Slayer began in 2005, when Lemke first pitched the idea. D. J. Caruso was hired to direct the film in January 2009, but in September of that year, Caruso was replaced by Singer, who hired McQuarrie and Studney to rework the script. The main characters were cast between February and March 2011, and principal photography began in April 2011 in England with locations in Somerset, Gloucestershire and Norfolk. The release of the film was moved back in post-production to allow more time for visual effects and marketing.

Jack the Giant Slayer premiered on February 26, 2013, in Hollywood. It was released theatrically in the United States on March 1, 2013, receiving mixed reviews from critics and was a box-office failure, earning $197 million worldwide against the budget of $185–200 million.