| I Liga | |
| Pixels: | 150 |
| Organiser: | Polish Basketball Association |
| Founded: | 1954 |
| First: | 1954–55 |
| Country: | Poland |
| Confed: | FIBA Europe |
| Teams: | 14 |
| Promotion: | Polish Basketball League |
| Relegation: | II Liga |
| Levels: | 2 |
| Champions: | Sokół Łańcut (1st) |
| Season: | 2021–22 |
The I Liga (English: First League) 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.
| width=70 | Season | width=160 | Champions | width=160 | Runners-up |
|---|---|---|---|---|---|
| MCKiS Jaworzno | |||||
| Politechnika Poznańska | |||||
| Legia Warsaw | |||||
| GTK Gliwice | |||||
| Sokół Łańcut | |||||
| Śląsk Wrocław | |||||
| Czarni Słupsk | |||||
| Górnik Wałbrzych | |||||
| Górnik Wałbrzych |