The 2019–20 BLNO was the 20th season of the Basketball League of Norway since its establishment.
On 11 March 2020, the season was ended prematurely due to the coronavirus pandemic.
[1] 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.
The playoffs were played in a best-of-three games format.