| Competition: | III liga |
| Season: | 2019–20 |
| Winners: | Sokół Ostróda KKS 1925 Kalisz Śląsk Wrocław II Motor Lublin |
| Relegated: | None |
| Matches: | 665 |
| Total Goals: | 1869 |
| League Topscorer: | Mateusz Żebrowski (20 goals) (Group 2) |
| Biggest Home Win: | Motor 7–0 Chełmianka (Group 4) |
| Biggest Away Win: | Unia 0–6 Sokół (Group 1) Podlasie 0–6 Wisła (Group 4) |
| Highest Scoring: | Ruch 7–2 Starowice Dolne (Group 3) |
| Longest Wins: | 8 matches Znicz (Group 1) |
| Longest Unbeaten: | 18 matches Radunia (Group 2) |
| Longest Winless: | 18 matches Starowice Dolne (Group 3) |
| Longest Losses: | 7 matches Polonia (Group 1) Starowice Dolne (Group 3) |
| Highest Attendance: | 6,800[1] Ruch 3–1 Polonia (Group 3) |
| Prevseason: | 2018–19 |
| Nextseason: | 2020–21 |
The 2019–20 III liga was the 12th season of the fourth tier domestic division in the Polish football league system since its establishment in 2008 under its current title (III liga) and the 4th season under its current league division format.
The competition was contested by 72 clubs split geographically across 4 groups of 18 teams each, with the winners of each group gaining promotion to the II liga. The season was played in a round-robin tournament. It began in August 2019 and was supposed to end in June 2020. The teams included amateur clubs (although a few are semi-professional) and the reserve teams of professional clubs.
The season was suspended indefinitely on 12 March 2020 due to the COVID-19 pandemic.[2] On May 14–18, 2020, the regionals federations announced the termination of the competition. The leaders of each group (except Group 4) have been promoted to the II liga. No team has been relegated to the IV liga.[3]
72 teams are divided into four groups according to geographical criteria:
Each group of III liga is managed by a different voivodeship football association. In the 2019–20 season these are the following regionals federations:[4]
| Competition: | III liga Group 1 |
| Season: | 2019–20 |
| Winners: | Sokół Ostróda |
| Relegated: | None |
| Matches: | 170 |
| Total Goals: | 494 |
| League Topscorer: | Damian Warchoł (18 goals) |
| Biggest Home Win: | Świt 7–1 Wasilków |
| Biggest Away Win: | Unia 0–6 Sokół |
| Highest Scoring: | Świt 5–3 Pogoń Lechia 5–3 Unia Świt 7–1 Wasilków |
| Longest Wins: | 8 matches Znicz |
| Longest Unbeaten: | 11 matches Sokół |
| Longest Winless: | 9 matches Polonia Wasilków |
| Longest Losses: | 7 matches Polonia |
| Competition: | III liga Group 2 |
| Season: | 2019–20 |
| Winners: | KKS 1925 Kalisz |
| Relegated: | None |
| Matches: | 162 |
| Total Goals: | 463 |
| League Topscorer: | Mateusz Żebrowski (20 goals) |
| Biggest Home Win: | Polonia 6–0 Unia |
| Biggest Away Win: | Gwardia 1–6 Unia |
| Highest Scoring: | Radunia 6–2 Kotwica |
| Longest Wins: | 6 matches Kalisz Mieszko Kotwica |
| Longest Unbeaten: | 18 matches Radunia |
| Longest Winless: | 9 matches Grom |
| Longest Losses: | 6 matches Jarota |
| Competition: | III liga Group 3 |
| Season: | 2019–20 |
| Winners: | Śląsk Wrocław II |
| Relegated: | None |
| Matches: | 162 |
| Total Goals: | 474 |
| League Topscorer: | Mariusz Idzik (14 goals) |
| Biggest Home Win: | Piast 5–0 Starowice Dolne Ruch 7–2 Starowice Dolne |
| Biggest Away Win: | Starowice Dolne 1–6 Falubaz |
| Highest Scoring: | Ruch 7–2 Starowice Dolne |
| Longest Wins: | 5 matches Pniówek |
| Longest Unbeaten: | 10 matches Ruch |
| Longest Winless: | 18 matches Starowice Dolne |
| Longest Losses: | 7 matches Starowice Dolne |
| Highest Attendance: | 6,800 Ruch 3–1 Polonia |
| Competition: | III liga Group 4 |
| Season: | 2019–20 |
| Winners: | Motor Lublin |
| Relegated: | None |
| Matches: | 171 |
| Total Goals: | 438 |
| League Topscorer: | Rafał Król Krzysztof Ropski (16 goals each) |
| Biggest Home Win: | Motor 7–0 Chełmianka |
| Biggest Away Win: | Podlasie 0–6 Wisła |
| Highest Scoring: | Korona II 6–2 Podlasie Motor 4–4 Korona II |
| Longest Wins: | 5 matches Motor |
| Longest Unbeaten: | 11 matches Hutnik Wólczanka |
| Longest Winless: | 15 matches Chełmianka Podlasie |
| Longest Losses: | 4 matches Jutrzenka Hetman Orlęta Podlasie |