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The X-Files is a Peabody, Golden Globe and Emmy Award-winning American science fiction television series created by Chris Carter, which first aired on September 10, 1993, and ended on May 19, 2002. The show was a hit for the Fox Broadcasting Company network, and its main characters and slogans (e.g., "The Truth Is Out There", "Trust No One", "I Want to Believe") became pop culture touchstones. The X-Files is seen as a defining series of the 1990s, coinciding with the era's widespread mistrust of governments, interest in conspiracy theories and spirituality, and the belief in the existence of extraterrestrial life.

In the series, FBI agents Fox Mulder (David Duchovny) and Dana Scully (Gillian Anderson) are tasked with investigating the "X-Files": marginalized, unsolved cases involving paranormal phenomena. Mulder plays the role of the "believer", having faith in the existence of aliens and the paranormal, while Scully is a skeptic, initially assigned by her departmental superiors to debunk Mulder's unconventional work. As the show progressed, both agents were caught up in a larger conflict, termed "the mythology" or "mytharc" by the show's creators, and developed a close relationship which was often seen as romantic rather than platonic. The complex and more romantic side was explored further in subsequent films years after the series ended. The X-Files also featured stand-alone episodes ranging in tone from horror to comedy, in which Mulder and Scully investigated uniquely bizarre cases without long-term implications on the storyline. These so-called "monster of the week" episodes made up roughly two-thirds of the series.

The show's popularity peaked in the mid-to-late 1990s, leading to a first feature film in 1998, followed by a post-series sequel in 2008. In the last two seasons, Anderson became the star as Duchovny appeared rarely, and new central characters were introduced: FBI Agents John Doggett (Robert Patrick) and Monica Reyes (Annabeth Gish). At the time of its final episode, The X-Files was the longest running sci-fi show ever on American television.