| Organising body | Tunisia Basketball Federation | 
|---|---|
| Founded | 1956 | 
| First season | 1956–57 | 
| Country | Tunisia | 
| Confederation | FIBA Africa | 
| Number of teams | 16 | 
| Level on pyramid | 2 | 
| Promotion to | Championnat Pro A | 
| Relegation to | Championnat Nationale 2 | 
| Domestic cup(s) | Tunisian Basketball Cup | 
| Current champions | EO La Goulette Kram (1st title) (2022-23) | 
| Most championships | Stade Gabèsien (2 titles) | 
| Website | ftbb.org.tn | 
The Championnat Nationale 1 is the second division of the Tunisian men's basketball system. The league is currently contested by 18 teams and is named the Nationale 1 since 2020. [1] The highest-placed teams are promoted to the Championnat Pro A.
The Nationale 1 is played in the following system: [1]
| Season | Champions | 
|---|---|
| 1958–59 | ES Tunis | 
| 2009–10 | Tunis Air Club | 
| 2013–14 | Sfax RS | 
| 2014–15 | DS Grombalia | 
| 2015–16 | Stade Gabèsien | 
| 2016–17 | Espoir Sportif Tunisien | 
| 2017–18 | CA Bizertin | 
| 2018–19 | Stade Gabèsien | 
| 2019–20 | Ezzahra Sports | 
| 2020–21 | SS Sfaxien | 
| 2021–22 | Étoile du Sahel | 
| 2022–23 | ES Goulettoise | 
| 2023–24 | BC Mahdia | 
| 2024–25 | Stade Nabeulien |