The 2019–20 Korisliiga season was the 80th season of the top professional basketball league in Finland.
On 13 March 2020, the season was ended prematurely due to the coronavirus pandemic.
The eight best qualified teams would join the playoffs, the 11th qualified would play a best-of-three relegation playoff against the First Division runners-up and the last team would be directly relegated.
However, the league ended without finishing the regular season.
Lahti promoted as champion of the First Division.