The XFL was a professional American football league that played for one season in 2001. The league was founded by Vince McMahon, the Chairman of the Board of Directors of WWE (formerly known as the World Wrestling Federation, Inc.). The XFL was intended to be a major professional sports league complement to the offseason of the NFL, but it failed to find an audience and folded after its first and only season.

Created as a joint venture between NBC and the World Wrestling Federation under the company name "XFL, LLC", the XFL was created as a "single-entity league", meaning that the teams were not individually owned and operated franchises (as in the NFL), but that the league was operated as a single business unit.

The concept of the league was first announced on February 3, 2000. The XFL was originally conceived to build on the success of the NFL and professional wrestling. It was hyped as "real" football without penalties for roughness and with fewer rules in general. The loud games featured players and coaches with microphones and cameras in the huddle and in the locker rooms. Stadiums featured trash-talking public address announcers and scantily-clad cheerleaders. Instead of a pre-game coin toss, XFL officials put the ball on the ground and let a player from each team scramble for it to determine who received the kickoff option, which led to the first XFL injury. This type of "coin toss" has since been referred to as the "injury zone."

On April 21, 2001, the season concluded as the Los Angeles Xtreme defeated the San Francisco Demons 38-6 in the XFL Championship Game (which was originally given the Zen-like moniker "The Big Game at the End of the Season", but was later dubbed the Million Dollar Game, after the amount of money awarded to the winning team).

One reason for the failure of the league to catch on, despite its financial solvency and massive visibility (perhaps infamy), was the lack of respect for the league in the sports media. XFL games were rarely treated as sports contests, but rather more like WWF-like sensationalized events. With few NFL-quality players, save Tommy Maddox, the league's MVP, and with little thoughtful analysis or even consideration by sports columnists, the XFL never gained the necessary recognition to be regarded as a viable league. The fact that the league was co-owned by NBC made ESPN (which was part of the same corporation as ABC) and Fox Sports Net (owned by Fox TV) disinclined to report on the XFL, though Time Warner properties such as Sports Illustrated, as well as the Associated Press, devoted coverage to the league. Many local TV newscasts and newspapers (even in XFL cities) did not report league scores or show highlights. This led to many football fans treating the XFL as a joke, rather than competition to the NFL.