The 2020–21 PlusLiga was the 85th season of the Polish Volleyball Championship, the 68th season of the highest tier domestic division in the Polish volleyball league system since its establishment in 1954, and the 21st season as a professional league.
The league is operated by the Polish Volleyball League SA (Polish: Polska Liga Siatkówki SA).
The regular season was played as a round-robin tournament.
The season started on 11 September 2020 and concluded on 21 April 2021.
Jastrzębski Węgiel won their 2nd title of the Polish Champions.