The North American Soccer League was the second division of professional soccer in the United States from 2011 to 2017. Each season consisted of 7–12 teams and also included clubs from Canada and Puerto Rico.
The following is a list of all NASL seasons. It contains the number of teams, the number of regular-season games played per team, the champion—winner of the NASL Soccer Bowl, the winners of the regular-season (North American Supporters' Trophy), starting in 2013 the winner of the Spring and a Fall seasons, the winner of the Most Valuable Player Award (MVP), the top scorer(s)—winner of the Golden Boot, and the regular-season average attendance.
| Season | Teams | Games | Champion | Top record | Spring | Fall | MVP | Top scorer | Att. | Ref |
|---|---|---|---|---|---|---|---|---|---|---|
| 2011 | 8 | 28 | NSC Minnesota Stars | Carolina RailHawks | — | — | Etienne Barbara | Etienne Barbara | 3,770 | [1] |
| 2012 | 8 | 28 | Tampa Bay Rowdies | San Antonio Scorpions | — | — | Pablo Campos | Pablo Campos | 3,806 | [2] |
| 2013 | 8 | 26 | New York Cosmos | Carolina RailHawks | Atlanta Silverbacks | New York Cosmos | Georgi Hristov | Brian Shriver | 4,670 | [3] |
| 2014 | 10 | 27 | San Antonio Scorpions | Minnesota United | Minnesota United | San Antonio Scorpions | Miguel Ibarra | Christian Ramirez | 5,501 | [4] |
| 2015 | 11 | 30 | New York Cosmos | New York Cosmos | New York Cosmos | Ottawa Fury FC | ||||
| 2016 | 12 | 32 | New York Cosmos | New York Cosmos | Indy Eleven | New York Cosmos | ||||
| 2017 | 8 | 32 | San Francisco Deltas | Miami FC | Miami FC | Miami FC |