The 2021 Indoor Football League season was the thirteenth (and twelfth complete) season of the Indoor Football League (IFL). The league played the season with twelve teams, down from thirteen the previous season, by adding one expansion team, one team from the National Arena League, one team from the American Arena League, and four teams going on hiatus. In addition, three existing teams made their IFL on-field debut after the 2020 season was cancelled because of the COVID-19 pandemic.