The 2020–21 Junior ABA League was the fourth season of the Junior ABA League with eight men's under-19 teams from Bosnia and Herzegovina, Montenegro, and Serbia.

The season will a single-elimination tournament held in Čajetina, Serbia from 21–24 May 2021.

[1] Mega Soccerbet U19 won its second Junior ABA League title defeating Budućnost VOLI U19 in the final.

Guard Nikola Jović was named the Junior ABA League MVP award.

[2] A total of 8 teams contested the league, excluding representatives from Croatia, North Macedonia, and Slovenia.