|North American Soccer League|
|Founded||November 10 2009|
|Number of teams||11|
|Levels on pyramid||2|
|Domestic cup(s)|| Lamar Hunt U.S. Open Cup|
|Current champions||San Francisco Deltas (1 title) ()|
|Most successful club||New York Cosmos (3 titles)|
The North American Soccer League (NASL) is a professional men's soccer league with four teams in the United States, including one in Puerto Rico. It is headquartered in New York City.
From its inaugural season in 2011 through 2017, it was sanctioned by the United States Soccer Federation (U.S. Soccer) as a Division II league in the United States soccer league system, under Major League Soccer (MLS) and alongside United Soccer League (formerly USL Pro). However, U.S. Soccer denied the league Division II status for 2018, as the NASL did not meet the sanctioning criteria, and the future is uncertain as the NASL appeals the ruling. After initially postponing the 2018 season, the league was denied a preliminary injunction to prevent that loss of its Division II sanctioning and announced it had canceled its 2018 season and hopes to return for a 2019 season.
The league is named for, but has no connection to, the original North American Soccer League. The modern NASL was founded in 2009, and began play in 2011 with eight teams, following a 2010 season that saw NASL and USL teams play in a combined temporary Division II league.
Teams that still compete today from the 2017 season are Miami FC (USL) Indy 11 (USL), New York Cosmos, Tampa Bay Rowdies (USL), and Carolina Railhawks (Rebranded to North Carolina FC: USL.
The NASL uses a split-season schedule running from April to early November, with a four-week break in July. The spring and fall champions, along with the two teams with best combined spring/fall records meet in a four-team single-elimination tournament known as The Championship. The winner of the final claims the Soccer Bowl trophy at the end of the season. While there is no promotion and relegation with other leagues, then-Commissioner Bill Peterson repeatedly stated that the league has an interest in introducing it to the pyramid.