The 2018–19 BLNO is the 19th season of the Basketball League of Norway since its establishment.
The ten participating teams first played the regular season, that consisted in a round-robin schedule containing three rounds with every team playing each opponent at least once home and once away for a total of 27 matches.
At the end of the regular season, the top eight teams qualified for the playoffs.
Playoffs were played in a best-of-three games format.
Norwegian clubs came back to European competitions sixteen years after their last participation.