The I Liga (English: First League), officially known as the Bank Pekao S.A.

I Liga due to its sponsorship by Bank Pekao,[1] 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.