| Klasa B | |
| Country: | Poland |
| Confed: | UEFA |
| Teams: | 1000+ (in 2020–21) |
| Promotion: | Klasa A |
| Relegation: | Klasa C |
| Levels: | 8/9 |
| Domest Cup: | Polish Cup |
Klasa B represents the eighth (or ninth in some regions) level of the Polish football hierarchy.[1] Teams promoted from Klasa B move up to Klasa A, whilst relegated teams descend to the Klasa C leagues (where the latter league exists).[1]