The 2020–21 II liga was the 73rd season of the third tier domestic division in the Polish football league system since its establishment in 1948 and the 13th season of the Polish II liga under its current title.

Due to the COVID-19 pandemic, the 120 matches have been played with a limited number of spectators.

The rest of the matches (until 17 October 2020 and on 16 May 2021) were played behind closed doors without any spectators.

The winner of final match, Skra Częstochowa, won promotion to I liga for next season.

All matches were played in a stadiums of team which occupied higher position in regular season.