The I Liga (English: First League), officially known as the Bank Pekao S.A. I Liga due to its sponsorship by Bank Pekao, is the second-tier level league of basketball in Poland. It is organised by the Polish Basketball Association. Teams that win the championship have the option to be promoted to the first-tier level Polish Basketball League (PLK). The first I Liga season was held in the 1954–55 season.

Recent champions Season Champions Runners-up Polfarmex Kutno MCKiS Jaworzno Stal Ostrów Wielkopolski Politechnika Poznańska Miasto Szkła Krosno Legia Warsaw Legia Warsaw GTK Gliwice Spójnia Stargard Sokół Łańcut Astoria Bydgoszcz Śląsk Wrocław Górnik Wałbrzych Czarni Słupsk Czarni Słupsk Górnik Wałbrzych Sokół Łańcut Górnik Wałbrzych Dziki Warsaw Górnik Wałbrzych Górnik Wałbrzych Astoria Bydgoszcz Miasto Szkła Krosno Astoria Bydgoszcz Astoria Bydgoszcz ŁKS Coolpack Łódź

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