2017–18 Liga Nacional de Básquet season

The 2017–18 Liga Nacional de Básquet season is the 34th season of the top professional basketball league in Argentina. The season started on 20 September 2017 with the Torneo Súper 20, which finished on 18 November 2017. The regular season began on 29 November 2017 and finished on 6 May 2018. Starting this season, the competition format underwent significant changes. Instead of two conferences (North and South), all 20 teams are placed in a single group and play a double round-robin, where the best 16 teams at the end of the season qualify for the championship playoffs, while the two teams with the worst record play in a best-of-five relegation series. Before the start of the regular season, the Torneo Súper 20 took place, which awarded two berths to the 2018 Liga Sudamericana de Básquetbol. Salta Basket was relegated after losing the playoff series against Ferro Carril Oeste. San Lorenzo won their third consecutive title, defeating San Martín de Corrientes in the finals.