The League of Extraordinary Gentlemen, also promoted as LXG, is a 2003 steampunk/dieselpunk superhero film loosely based on the first volume of the comic book series of the same name by Alan Moore and Kevin O'Neill. Distributed by 20th Century Fox, it was released on 11 July 2003 in the United States, and 17 October in the United Kingdom. It was directed by Stephen Norrington and starred Sean Connery, Naseeruddin Shah, Peta Wilson, Tony Curran, Stuart Townsend, Shane West, Jason Flemyng, and Richard Roxburgh. It was Connery's final role in a theatrically released live-action film before his retirement in 2006 and death in 2020.

Dieselpunk is a retrofuturistic subgenre of science fiction similar to steampunk or cyberpunk that combines the aesthetics of the diesel-based technology of the interwar period through to the 1950s with retro-futuristic technology and postmodern sensibilities. Coined in 2001 by game designer Lewis Pollak to describe his tabletop role-playing game Children of the Sun, the term has since been applied to a variety of visual art, music, motion pictures, fiction, and engineering.