| Competition: | Slovenian Third League |
| Season: | 2019–20 |
| Promoted: | Šmartno 1928 (East) Primorje (West) |
| Relegated: | Odranci Ljutomer Veržej Radgona Bled Arne Tabor 69 Kočevje |
| League Topscorer: | Jetmir Torra (13 goals)[1] |
| Biggest Home Win: | Šampion 12–0 Radgona |
| Biggest Away Win: | Radgona 0–7 Odranci |
| Highest Scoring: | Šampion 12–0 Radgona |
| Prevseason: | 2018–19 |
| Nextseason: | 2020–21 |
The 2019–20 Slovenian Third League was the 28th edition of the Slovenian Third League. The season began on 24 August 2019 and was scheduled to end in June 2020.[2] The competition was cancelled on 17 April 2020 due to the COVID-19 pandemic.[3]
In the 2019–20 season, the Slovenian Third League was divided into two regional groups with a total of 26 participating clubs. The West group was composed of 14 clubs, and the East group of 12 clubs. The group winners earned direct promotion to the Slovenian Second League.
A total of 12 teams competed in the league, including 10 sides from the 2018–19 season and the 2 teams promoted from the Intercommunal Leagues (Korotan Prevalje and Podvinci).
| Club | Location | Stadium | 2018–19 position | |
|---|---|---|---|---|
| Bistrica | Slovenska Bistrica | Slovenska Bistrica Sports Park | 4th (3. SNL North) | |
| Dravinja | Slovenske Konjice | ŠRC Dobrava | 2nd (3. SNL North) | |
| Korotan Prevalje | Prevalje | Športni park Ugasle peči | 4th in MNZ Maribor | |
| Ljutomer | Ljutomer | ŠRC Ljutomer | 4th (3. SNL East) | |
| Odranci | Odranci | ŠRC Odranci | 2nd (3. SNL East) | |
| Podvinci | Podvinci | Podvinci Stadium | 1st in MNZ Ptuj | |
| Radgona | Gornja Radgona | Gornja Radgona Stadium | 10th (3. SNL East) | |
| Šampion | Celje | Olimp | 6th (3. SNL North) | |
| Šmartno | Šmartno ob Paki | Šmartno ob Paki Stadium | 3rd (3. SNL North) | |
| Veržej | Veržej | Čistina Stadium | 5th (3. SNL East) | |
| Videm | Videm pri Ptuju | Videm Sports Park | 5th (3. SNL North) | |
| Zreče | Zreče | Zreče Stadium | 7th (3. SNL North) |
| Club | Location | Stadium | 2018–19 position | |
|---|---|---|---|---|
| Adria | Miren | Pri Štantu Stadium | 5th (3. SNL West) | |
| Arne Tabor 69 | Ljubljana (Brod) | Maksov Gaj | 5th (3. SNL Centre) | |
| Bled | Bled | Bled Sports Centre | 1st (3. SNL Centre) | |
| Brinje-Grosuplje | Grosuplje | Brinje Stadium | 4th (3. SNL Centre) | |
| Ilirija 1911 | Ljubljana | Ilirija Sports Park | 15h in 2. SNL | |
| Izola | Izola | Izola City Stadium | 6th (3. SNL West) | |
| Kočevje | Kočevje | Gaj Stadium | 1st in MNZ Ljubljana | |
| Primorje | Ajdovščina | Ajdovščina Stadium | 4th (3. SNL West) | |
| Sava Kranj | Kranj | Stražišče Sports Park | 9th (3. SNL Centre) | |
| Svoboda Ljubljana | Ljubljana | Svoboda Sports Park | 6th (3. SNL Centre) | |
| Šenčur | Šenčur | Šenčur Sports Park | 7th (3. SNL Centre) | |
| Tolmin | Tolmin | Brajda Sports Park | 2nd (3. SNL West) | |
| Vipava | Vipava | Ob Beli Stadium | 3rd (3. SNL West) | |
| Žiri | Žiri | Polje Stadium | 8th (3. SNL Centre) |