It is a regional competition between men's teams from six countries: Bosnia and Herzegovina, Croatia, Montenegro, North Macedonia, Serbia and Slovenia.

The ABA League Assembly, held on July 24, 2017 in Belgrade, Serbia, decided to organize the Junior League with a desire to strengthen its position as the main power for development of basketball in the region.

[2] Mega Bemax became champions of the first-ever U19 ABA League Championship Final Four tournament, which took place in Laktaši in 2018, as they have beaten Crvena zvezda.

On 12 March 2020, the ABA League Assembly temporarily suspended the 2019–20 season due to the COVID-19 pandemic.

[3] On 27 May 2020, the ABA League Assembly canceled indefinitely the season due to the COVID-19 pandemic.