Primera Nacional
| Founded | 1986 |
|---|---|
| First season | 1986–87 |
| Country | Argentina |
| Confederation | CONMEBOL |
| Number of clubs | 36 |
| Level on pyramid | 2 |
| Promotion to | Primera División |
| Relegation to | Primera B Metropolitana Torneo Federal A |
| Current champions | Gimnasia y Esgrima (M) (2025) |
| Most championships | Banfield Olimpo (3 titles each) |
| Top scorer | Adrián Czornomaz (160) |
| Broadcaster(s) | Argentina: TyC Sports DirecTV Sports International: TNT Sports TyC Max |
| Website | afa.com.ar/primerabnacional |
| Current: 2026 Primera Nacional | |
Primera Nacional, (usually called simply Nacional B, (English "National B Division"), and known as Primera B Nacional until the 2019–20 season) popularly known as La B (The B), is the second division of the Argentine football league system. The competition is made up of 38 teams.
It is played by teams from all over the country. Clubs from Buenos Aires surroundings, as well as some from Santa Fe Province, are promoted from or relegated to the Primera B Metropolitana ("Metropolitan B Division") while for teams from the other provinces the Torneo Federal A ("Federal A Tournament") is the next level down. In Argentine football, Primera Nacional is the second-highest league, and from it, the three best teams are automatically promoted to Primera División.
Primera B Nacional games are often transmitted to Argentina and abroad on television by TyC Sports.