The 2020–21 Belgian Division 3 was the fifth season of the division in its current format, placed at the fifth-tier of football in Belgium and the first under this name, after being renamed (Belgian) Division 3 from (Belgian) Third Amateur Division. The season was cancelled in January 2021 with just a few matches played, as measures taken by the Belgian government against the spread of COVID-19 prohibited amateur football.[1]
The division consist of four separate leagues. Leagues VFV A and VFV B consist of teams with a license from the Voetbalfederatie Vlaanderen (VFV, the Flemish/Dutch speaking wing of the Belgian FA), while the leagues ACFF A and ACFF B contain teams with a license from the Association des Clubs Francophones de Football (ACFF, the French-speaking wing of the RBFA). The champions from each of the four leagues would normally have been promoted to the 2021–22 Belgian Division 2, but due to the cancellation no teams were promoted or relegated.
Diest was promoted as the champion of the Flemish-speaking teams in the region matching the former Province of Brabant and Brussels.
With the 2019–20 season ending prematurely due to the COVID-19 pandemic in Belgium, all vacant positions were filled up by the highest finishing teams from the same province as the disappearing clubs. Clubs promoted as a result per province:
Furthermore two clubs were without a license and hence were also relegated to the Belgian Provincial Leagues: Wingene (had not applied for a license) and Walhain (moved to Beauvechain and changed its name to FC Golden Black causing its license to be removed).
^On 3 April 2020, Stade Braine announced it would merge with neighboring Tubize to form Royale Union Tubize-Braine, which will start playing at the current level of Tubize, the Belgian Division 2. As such, the place of Stade Braine in the Belgian Division 3 will be vacated. [4]