Klasa B
| Country | Poland | 
|---|---|
| Confederation | UEFA | 
| Number of clubs | 1000+ (in 2020–21) | 
| Level on pyramid | 8/9 | 
| Promotion to | Klasa A | 
| Relegation to | Klasa C | 
| Domestic cup(s) | Polish Cup | 
Klasa B represents the eighth (or ninth in some regions) level of the Polish football hierarchy. Teams promoted from Klasa B move up to Klasa A, whilst relegated teams descend to the Klasa C leagues (where the latter league exists).