Liga ABA, also known as Adriatic League, currently known as the NLB Liga ABA for sponsorship reasons, is a top-level regional basketball league that features teams from:
- Bosnia and Herzegovina
- Croatia
- Czech Republic
- Montenegro
- Serbia
- Slovenia
The league exists alongside scaled-down versions of domestic leagues in each country (Košarkaška liga Srbije, A1 Liga, Prvenstvo BiH, 1. SKL, Opportunity Liga). All of its teams join their country's own competitions in late spring after the Adriatic League regular season and post-season have been completed.
The league is a private venture, founded in 2001 and organized by Slovenian limited liability company called Sidro. Adriatic Basketball Association is the body that organizes the league and is a full member of ULEB and a voting member of the Euroleague board, so this league can be considered as a local version of the Europe-wideEuroleague, in which a few Adriatic League clubs also compete (usually Partizan, Cibona, and Olimpija). Adriatic League has inspired a similar competition in the Baltic states, the Baltic Basketball League or Baltic League.
