The Slovenian Basketball League (Slovene: 1. slovenska košarkarska liga), abbreviated as 1.

SKL and known as the Liga OTP banka due to sponsorship reasons, is the top-level professional men's basketball league in Slovenia.

The league is operated by the Basketball Federation of Slovenia and consists of eleven clubs.

Before the independence, the Slovenian Republic League was played as a second or third level of Yugoslav basketball.

If a team competes in international competitions (Basketball Champions League, EuroLeague or EuroCup Basketball) and plays at least ten international games per season, that team automatically enters the quarterfinals and does not compete in the regular season.