The competition was contested by 84 clubs split geographically across 4 groups, with the winners of each group gaining promotion to the II liga. The season was played in a round-robin tournament. It began in August 2020 and ended in June 2021. The teams included semi-professional clubs (although a few are professional) and the reserve teams of professional clubs.
Source: 90minut.pl Rules for classification: 1. Number of points reached in the entire series of games; 2. Number of points reached in direct matches; 3. Goal difference in direct matches; 4. Goal difference in direct matches – away goals counted twice; 5. Goal difference in the whole series of games; 6. Number of goals scored in the entire series of games. (C) Champions; (P) Promoted
Source: 90minut.pl Rules for classification: 1. Number of points reached in the entire series of games; 2. Number of points reached in direct matches; 3. Goal difference in direct matches; 4. Goal difference in direct matches – away goals counted twice; 5. Goal difference in the whole series of games; 6. Number of goals scored in the entire series of games. (C) Champions; (P) Promoted Notes:
^Bałtyk Koszalin avoided relegation as Bytovia Bytów did not apply for a III liga license due to financial difficulties.
Source: 90minut.pl Rules for classification: 1. Number of points reached in the entire series of games; 2. Number of points reached in direct matches; 3. Goal difference in direct matches; 4. Goal difference in direct matches – away goals counted twice; 5. Goal difference in the whole series of games; 6. Number of goals scored in the entire series of games. (C) Champions; (P) Promoted
Updated to match(es) played on unknown. Source: 90minut.pl Rules for classification: 1. Number of points reached in the entire series of games; 2. Number of points reached in direct matches; 3. Goal difference in direct matches; 4. Goal difference in direct matches – away goals counted twice; 5. Goal difference in the whole series of games; 6. Number of goals scored in the entire series of games. (C) Champions; (P) Promoted; (R) Relegated