The 2020–21 Polish Basketball League (PLK) season, the Energa Basket Liga for sponsorship reasons, was the 87th season of the Polish Basketball League, the highest professional basketball league in Poland.

Stelmet Enea Zielona Góra were the defending champions.

[1] Arged BM Slam Stal Ostrów Wielkopolski won its first ever national championship.

Due to the coronavirus pandemic, there were no relegation or promotion.

Quarterfinals and semifinals are played in a best-of-five format (2–2–1) while the finals in a best-of-seven one (2–2–1–1–1).