The Lone Gunmen were a trio of fictional characters who had recurring roles on The X-Files and also starred in a short-lived spin-off, also called The Lone Gunmen. The name was derived from the lone gunman theory.

Described as counterculture patriots, they were ardent conspiracy theorists, government watchdogs, and computer hackers who frequently assisted central X-Files characters Mulder and Scully, though they sometimes had their own adventures. The Lone Gunmen authored a news publication called The Magic Bullet Newsletter (a pejorative reference to the single bullet theory and, like the group's name, a reference to the Kennedy assassination), later renamed The Lone Gunman, of which Mulder was a loyal subscriber. None of them had day jobs; they relied on financial backers who believed in their cause, and what revenue the subscriptions to their paper generated. They shared a loft apartment (where they also worked) and used a 1970 VW Transporter (minibus) to commute.

The Lone Gunmen is a television show created by Chris Carter and broadcast on FOX. It is a spin off of Carter's popular long running The X-Files, starring several of the show's characters. The show was first broadcast in March 2001 and, despite good reviews, it was cancelled because of a drop in ratings. The last episode was broadcast in June 2001 and ended on a cliffhanger which was resolved in a ninth season episode of The X-Files entitled Jump the Shark.

The series revolved around the three characters of The Lone Gunmen; Melvin Frohike, John Fitzgerald Byers and Richard Langly, a group of "geeky" investigators who ran a conspiracy theory magazine. They had often helped FBI Special Agent Fox Mulder on The X-Files.

Spin-off of The X-Files featuring the trio of computer-hacking conspiracy geeks popularly known as The Lone Gunmen. Never ones to stray far from the center of corporate and government intrigue, the threesome of John Byers, Melvin Frohike, and Richard Langly play like a misguided Mission Impossible team, embarking on a series of comic adventures that simultaneously highlight their genius and ineptitude. While their newfound independence inspires them to investigate even the most shadowy of conspiracies, their social skills remain stagnant, which only makes their lives more difficult when they learn their chief competitor in the "information business" is the brilliant and beautiful Yves Adele Harlow. Perpetually short of funds to publish The Lone Gunmen newspaper, Byers, Frohike and Langly begrudgingly take on Jimmy Bond as an unlikely benefactor who bankrolls their missions and joins them in their investigations to uncover the truth. Written by Ronos