2020–21 Third Amateur Football League (Bulgaria)

The 2020–21 Third Amateur Football League season was the 71st of the Bulgarian Third Amateur League. The group is equivalent to the third level of the Bulgarian football pyramid, comprising four divisions based on geographical areas. These divisions are the North-West, North-East, South-East, and South-West. The number of teams in each division varies, similarly to previous seasons. The season started on 8 August 2020, a delay of two weeks due to the COVID-19 situation in Bulgaria.

The first round match between Etar's second team and Levski 2007 (Levski), which was originally to be held on 9 August, was postponed after Hristo Markov from the Veliko Tarnovo team tested positive for the virus. Two more matches (from the second round) will also be held at a later date than the on which they were set to be played - between Etar II and OFK Tryavna (even though all the other Etar team members' test results were negative) as well as the Levski 2020 (Lom) versus Lokomotiv Mezdra encounter, the latter due to repair work pertaining to the building and the pitch of Lom's city stadium. On 29 September 2020, FC Kyustendil (Kyustendil) were deducted three points due to withdrawing their junior youth team from the group in which it was competing. On 10 October 2020, the match between Granit Vladaya and Velbazhd was abandoned during the second half with approximately 20 minutes remaining and the score tied at 0:0 after a verbal exchange between the Granit captain Georgi Gaydarov and a fan resulted in the former confronting the supporter, which led to a mass fight in the stands, with the match officials also being hurt in the melee. Granit eventually received a six-match ban on hosting games while Velbazhd were awarded a 3:0 win by default.

Promoted to Second League

 * Dobrudzha Dobrich
 * Sozopol
 * Yantra Gabrovo
 * Minyor Pernik
 * Sportist Svoge
 * Septemvri Simitli

Relegated to Regional Leagues (Disqualified)

 * Kaliakra Kavarna
 * Lokomotiv Ruse

Promoted from Regional Leagues

 * Spartak Plovdiv
 * Sportist General Toshevo
 * Pirin Gotse Delchev
 * Velbazhd Kyustendil
 * Inter Dobrich

Relegated from Second League

 * Spartak Varna
 * Spartak Pleven
 * Vereya
 * Pomorie

Relegated from First League

 * Dunav Ruse (Relegated directly to Third League for financial problems)