The 2012–13 Lietuvos krepšinio lyga was the 20th season of the top-tier level professional basketball league of Lithuania, the Lietuvos krepšinio lyga (LKL).

Every team except Žalgiris and Lietuvos rytas played 22 games, two against each other.

Those two teams, due to their participation in EuroLeague, played only eleven games, all of them away.

Quarterfinal series were played with a best-of-three series format, semifinals with a best-of-five and the finals with a best-of-seven games format.

The last qualified of the Regular Season was relegated to the NKL.