III liga (Trzecia liga) is a Polish football league that sits in the fourth tier of the Polish football league system. Until the end of the 2007–08 season, III liga referred to a league at the third tier (now called II liga) but this was changed with the formation of the Ekstraklasa as the top level league in Poland.

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Groups of III liga are divided based on administrative division of Poland. Top teams of III liga are promoted to II liga and bottom teams are relegated to IV liga.

18–21 parallel divisions as IV liga (one or two in each of 16 Voivodeship)

• 2000–01 season – 21 groups
• 2001–02 season – 20 groups
• 2002–03 season – 19 groups
• 2003–04 season – 19 groups
• 2004–05 season – 19 groups
• 2005–06 season – 19 groups
• 2006–07 season – 18 groups
• 2007–08 season – 18 groups

8 parallel divisions as III liga.^[1]

• Group A (Łódź – Masovian)
• Group B (Podlaskie – Warmian-Masurian)
• Group C (Kuyavian-Pomeranian – Greater Poland)
• Group D (Pomeranian – West Pomeranian)
• Group E (Lower Silesian – Lubusz)
• Group F (Opole – Silesian)
• Group G (Świętokrzyskie – Lesser Poland)
• Group H (Lublin – Podkarpackie)

4 parallel divisions as III liga.^[2]

• Group I (Łódź – Masovian – Podlaskie – Warmian-Masurian)
• Group II (Kuyavian-Pomeranian – Greater Poland – Pomeranian – West Pomeranian)
• Group III (Lower Silesian – Lubusz – Opole – Silesian)
• Group IV (Świętokrzyskie – Lesser Poland – Lublin – Podkarpackie)