The X-Files (also known as The X-Files: Fight the Future) is a 1998 science fiction-horror-thriller written by Chris Carter and Frank Spotnitz, and directed by Rob Bowman. It is the first feature film based on The X-Files franchise created by Carter. Three main characters from the television series re-appear in the film. David Duchovny, Gillian Anderson and Mitch Pileggi, reprise their respective roles as Fox Mulder, Dana Scully and Walter Skinner. The film's tagline and sub-title is Fight the Future, the film is commonly mistaken as The X-Files: Fight the Future.

The story follows Fox Mulder (David Duchovny) and Dana Scully (Gillian Anderson) uncovering what seems to be a government conspiracy attempting to hide the truth about an alien colonization of Earth. If viewed in the context of The X-Files chronology, the film takes place between seasons five and six of the television series, and unlike the second film, The X-Files: I Want to Believe, is based upon the series' extraterrestrial mythology.