IV liga (Czwarta liga) is the fifth level of the Polish football league system. The current structure of IV liga was created in the 2000–01 season after introducing the new administrative division of Poland. Groups consist most often of 18 clubs, which each group winner earning promotion to III liga. The bottom clubs are relegated to Liga okręgowa or V liga (depending on the voivodeship).
Until the end of the 2007–08 season,[1] IV liga was the fourth tier of league system, but this was changed with the formation of the Ekstraklasa as the highest level of football league in Poland.
In the 2024–25 season, there are 16 parallel groups of IV liga.