The regular season was played as a round-robin tournament. A total of 16 teams participated, 13 of which competed in the league during the previous season, while the remaining three were promoted from the 2019–20 I liga. On 24 July 2020 Ekstraklasa SA and Polish Football Association announced the 2020–21 season calendar. The season started on 21 August 2020 and concluded on 16 May 2021. Due to the season start being delayed due to the COVID-19 pandemic it was shortened to 30 matchdays without a split into Championship and Relegation groups. Each team played a total of 30 matches, half at home and half away. After the 14th matchday the league went on a winter break between 21 December 2020 and 28 January 2021. 2020–21 was a transition season (only the team which took 16th position after the season was relegated to I liga) to extend Ekstraklasa from 16 to 18 teams starting with the 2021–22 season.[6] During 2020–21 season a substitution limit increased from three to five.[7] It was the fourth Ekstraklasa season to use VAR. Due to the COVID-19 pandemic, only 51 matches were played with a limited number of spectators. The rest of the matches (between 17 October 2020 and 15 May 2021) were played behind closed doors without any spectators.
Source: ekstraklasa.org Rules for classification: 1) Points; 2) Head-to-head points; 3) Head-to-head goal difference; 4) Head-to-head goals scored; 5) Head-to-head away goals scored (only if between two teams); 6) Goal difference; 7) Goals scored; 8) Number of wins; 9) Number of away wins; 10) Fairplay ranking; 11) Draw[43] (C) Champions; (R) Relegated Notes:
^Raków Częstochowa qualified for the Europa Conference League by winning the 2020–21 Polish Cup and also by finishing second in the Ekstraklasa. As a result, the berth reserved for third place was passed to the fourth-placed team from the 2020–21 Ekstraklasa.
^Cracovia was deducted 5 points for match-fixing during the 2003–04 II liga season (second tier at the time).[42]
Positions by round
Note: The list does not include the matches postponed to a later date but includes all games played in advance.[F][G]
The place taken by the team that played fewer matches than the opponents was underlined.
Source: ekstraklasa.org Legend: Blue = home team win; Yellow = draw; Red = away team win. For upcoming matches, an "a" indicates there is an article about the rivalry between the two participants.
^Season total attendance after 51 matches (until 17 October 2020 and on 16 May 2021). All matches have been played with a limited number of spectators.
^Season total attendance after 51 matches (until 17 October 2020 and on 16 May 2021). All matches have been played with a limited number of spectators.
^He was the interim coach during the Lech's game against Legia Warsaw, on 11 April 2021.