The season began on 24 August 2019 and was scheduled to end in June 2020.
[3] In the 2019–20 season, the Slovenian Third League was divided into two regional groups with a total of 26 participating 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).
This article about a Slovenian association football competition is a stub.