The 2017–18 Liga Națională season was the 68th season of the Liga Națională, the highest professional basketball league in Romania.
U-BT Cluj-Napoca were the defending champion.
Timba Timișoara and Politehnica Iași promoted from the last Liga I.
There were not any relegations as there were only 11 teams in the previous season and Olimpic Baia Mare withdrew from the competition.
[1] All series were played in a best-of-five games format.