| 2012–13 Liga Nacional de Básquet season | |
| League: | Liga Nacional de Básquet |
| Sport: | Basketball |
| Duration: | 14 September 2012 – 10 March 2013 (regular season) 13 March – 15 May 2013 (playoffs) |
| No Of Teams: | 16 |
| Tv: | TyC Sports |
| Mvp: |  Paolo Quinteros |
| Top Scorer: |  Darren Phillip |
| Playoffs: | 2013 Liga Nacional de Básquet Playoffs |
| Finals Champ: | Regatas Corrientes |
| Finals Runner-Up: | Lanús |
| Finals Mvp: | Paolo Quinteros (Regatas Corrientes) |
| Seasonslistnames: | Liga Nacional de Básquet |
| Prevseason Link: | 2011–12 Liga Nacional de Básquet season |
| Prevseason Year: | 2011–12 |
| Nextseason Link: | 2013–14 Liga Nacional de Básquet season |
| Nextseason Year: | 2013–14 |
The 2012–13 Liga Nacional de Básquet season was the 29th season of the top professional basketball league in Argentina. The regular season started on 14 September 2012. Regatas Corrientes won their first title, defeating Lanús in the finals.
Torneo Nacional de Ascenso Champions from the previous season Unión Progresista and runners-up Argentino de Junín were promoted, occupying the berths left by Quilmes and San Martín de Corrientes. Unión Progresista would be relegated at the end of the season, together with 9 de Julio de Río Tercero.
| width=250px | Team | width=200px | City | width=200px | Arena | width=70px | Capacity |
|---|---|---|---|---|---|---|---|
| El Fortín de las Morochas | 1,465 | ||||||
| 3,730 | |||||||
| Osvaldo Casanova | 3,950 | ||||||
| 2,000 | |||||||
| 2,000 | |||||||
| 2,276 | |||||||
| Estadio Moisés Flesler | 2,100 | ||||||
| Antonio Rotili | 4,000 | ||||||
| El Hogar de los Tigres | 4,000 | ||||||
| 3,100 | |||||||
| 8,000 | |||||||
| 5,200 | |||||||
| José Jorge Contte | 4,000 | ||||||
| 4,500 | |||||||
| Estadio Carlos "Mona" Lobera | 1,750 |
The first stage took place between 14 September and 28 October 2012. Teams were divided into two zones. The top four teams from each zone competed in the Torneo Súper 8 that took place in November.
The eighth edition of Torneo Súper 8 took place on 7–10 November 2012 in the city of Corrientes, Corrientes. Regatas Corrientes won their second title, defeating Quimsa in the Final, and were granted a berth in the 2013 Liga Sudamericana de Básquetbol.
The second stage started on 1 November 2013. All 16 teams were ranked together. Each team carried over half of the points obtained in the first stage.
The Playoffs started on 13 March 2013 and ended on 15 May 2013. Regatas Corrientes defeated Lanús in the Finals and won their first title. Both teams were qualified for the 2014 FIBA Americas League. Since Regatas Corrientes had also qualified to the 2013 Liga Sudamericana de Básquetbol after winning the Torneo Súper 8, their berth was given to the next best team that was not qualified yet, in this case Argentino de Junín.
The relegation series began on 14 March. Unión Progresista and 9 de Julio de Río Tercero lost their respective series and were relegated to the Torneo Nacional de Ascenso.
| Team | Competition | Progress | |
|---|---|---|---|
| bgcolor=#C0C0C0 | Runners-up | ||
| Semifinals | |||
| Semifinals | |||
| Final four | |||
| bgcolor=gold | Champions |