The 2021 Kategoria e Tretë was the 18th official season of the Albanian football fourth division since its establishment.
The season began on 11 March 2021 and ended on 14 May 2021.
There are 6 teams competing this season.
Luftëtari and Murlani gained promotion to the 2021–22 Kategoria e Dytë.
Luftëtari won their first Kategoria e Tretë title.