The Basketball League Belgium (BLB) Division I, for sponsorship reasons, known as the EuroMillions Basketball League, is the highest tier level professional basketball league in Belgium for clubs. Through 2014, for sponsorship reasons, the league was previously known as the Ethias League, and from 2014–2016, it was known as the Scoore! League, for sponsorship reasons. The league is organized by the Basketball League Belgium.
The most successful team currently active in the league is Oostende, which holds the record for the most league titles won, with 16. The now defunct team, Racing Mechelen, is currently the team with the second most league titles won, with 15.
The BLB is played by the international FIBArules. Since 2014–15 the BLB season has a new format. In the regular season, all teams play each other first home and away. After that first round the league is divided in two groups based on standings; in the first group teams ranked 1–6 play and in the second 7–11. After the split each team plays all others in its group once home and once away. After that the Playoffs are played by eight teams. The quarterfinals consist of best-of-three series and the semi- and finals are played in a best-of-five format.
Not all awards are official ones handed out by the league itself, but all are regarded and respected as BLB awards. As example the Belgian Player of the Year award is handed out by the Belgian newspaper Het Nieuwsblad, but the league itself reports the winner on its website.