Notes
- On 22 May 2019 Kaliakra 1923-Levski 2012 (Kavarna) is renamed to Kaliakra 1923. The name change comes into force with the start of this season.
- On 7 August 2019 Lokomotiv (Ruse) withdraws due to organizational and financial reasons. ZS Varna is to confirm their withdrawal from the group.
- Shumen 2007 (Shumen) plays its home games at the "Panayot Volov" st. in Shumen.
- On 20 November 2019 Kaliakra 1923 (Kavarna) is removed from the group for a third no-show without an excusable reason. Its results are annulled.
- On 4 February 2020 Hitrino (Hitrino) withdraws. Its results still count and its opponents until the end of the season are awarded 3:0 wins.
- On 9 March 2020, Monday, the BFU decides to suspend all amateur football competitions as a prevention measure against the spread of the COVID-19 virus. On 13 March 2020, Friday, for the same reason a general emergency is declared in the country with effect until 14 April 2020. It is then further extended until 13 May. Given that, on 21 April 2020, Tuesday, the BFU and the AFL decide to declare the season in the amateur men's football for finished, with the standings as of the moment of suspension being declared final. The teams, placed 1st in the Treta liga groups, are promoted to Vtora liga with the exception of Yugozapadna Treta liga, where the top-2 teams contest a play-off for 1 spot in Vtora liga. There is no relegation from Treta liga.
Notes
- On 8 July 2019 Yantra Gabrovo (Gabrovo), 2nd last season; and Yantra 1919 (Gabrovo), 1st in OG Gabrovo last season; merge into Yantra 2019 (Gabrovo).
- On 9 March 2020, Monday, the BFU decides to suspend all amateur football competitions as a prevention measure against the spread of the COVID-19 virus. On 13 March 2020, Friday, for the same reason a general emergency is declared in the country with effect until 14 April 2020. It is then further extended until 13 May. Given that, on 21 April 2020, Tuesday, the BFU and the AFL decide to declare the season in the amateur men's football for finished, with the standings as of the moment of suspension being declared final. The teams, placed 1st in the Treta liga groups, are promoted to Vtora liga with the exception of Yugozapadna Treta liga, where the top-2 teams contest a play-off for 1 spot in Vtora liga. There is no relegation from Treta liga.
Notes
- On 17 July 2019 newly promoted Chiko Bunara (Byaga) declines participation in Treta liga due to financial constraints. ZS na BFS - Sofia decides that the group remains with 17 teams for this season.
- Kyustendil (Kyustendil) plays its home games at the "Osogovo" st. in Kyustendil.
- On 9 March 2020, Monday, the BFU decides to suspend all amateur football competitions as a prevention measure against the spread of the COVID-19 virus. On 13 March 2020, Friday, for the same reason a general emergency is declared in the country with effect until 14 April 2020. It is then further extended until 13 May. Given that, on 21 April 2020, Tuesday, the BFU and the AFL decide to declare the season in the amateur men's football for finished, with the standings as of the moment of suspension being declared final. The teams, placed 1st in the Treta liga groups, are promoted to Vtora liga with the exception of Yugozapadna Treta liga, where the top-2 teams contest a play-off for 1 spot in Vtora liga. There is no relegation from Treta liga.
- On 15 May 2020, Friday, following the withdrawal of Botev (Galabovo) from participation in next season's Vtora liga, the BFU cancels the provisioned 1st place play-off in Yugozapadna Treta liga and declares the standing as of the moment of suspension of play there final.
Notes
- On 14 June 2019 STK removes Vereya (Stara Zagora) from the group, due to a decision by the Licensing commission from 4 June 2019 g., which entered into force on 13 June 2019. Vereya can enter in Yugoiztochna Treta liga, but doesn't register for participation by the deadline - 13 July 2019.
- Dimitrovgrad 1947 (Dimitrovgrad) plays its home games at the "Minyor" st. in Dimitrovgrad.
- Maritsa 1921 (Plovdiv plays its home games at the "Maritsa" st. in Plovdiv.
- Rozova dolina (Kazanlak) plays its home games at the "Sevtopolis" st. in Kazanlak.
- Haskovo 1957 (Haskovo) plays its home games at the "Haskovo" st. in Haskovo.
- Chernomorets 1919 (Burgas) plays its home games at the "Chernomorets" st. in Burgas.
- On 11 September 2019 Sokol (Markovo) is deducted 3 points for a no-show without an excusable reason.
- On 21 January 2020 FK Haskovo 1957 (Haskovo) withdraws. Its results still count and its opponents until the end of the season are awarded 3:0 wins.
- On 9 March 2020, Monday, the BFU decides to suspend all amateur football competitions as a prevention measure against the spread of the COVID-19 virus. On 13 March 2020, Friday, for the same reason a general emergency is declared in the country with effect until 14 April 2020. It is then further extended until 13 May. Given that, on 21 April 2020, Tuesday, the BFU and the AFL decide to declare the season in the amateur men's football for finished, with the standings as of the moment of suspension being declared final. The teams, placed 1st in the Treta liga groups, are promoted to Vtora liga with the exception of Yugozapadna Treta liga, where the top-2 teams contest a play-off for 1 spot in Vtora liga. There is no relegation from Treta liga.