2009–10 Primera B Nacional
The 2009–10 Argentine Primera B Nacional was the 24th season of second division professional of football in Argentina. A total of 20 teams competed; the champion and runner-up were promoted to Argentine Primera División.
Club information
| Club | City | Stadium |
| Aldosivi | Mar del Plata | José MarÃa Minella |
| All Boys | Floresta | Islas Malvinas |
| Atlético de Rafaela | Rafaela | Nuevo Monumental |
| Belgrano | Córdoba | El Gigante de Alberdi |
| Boca Unidos | Corrientes | José Antonio Romero Feris |
| CAI | Comodoro Rivadavia | Municipal de Comodoro Rivadavia |
| Defensa y Justicia | Florencio Varela | Norberto "Tito" Tomaghello |
| Deportivo Merlo | Parque San MartÃn | José Manuel Moreno |
| Ferro Carril Oeste | Caballito | Arq. Ricardo Etcheverry |
| Gimnasia y Esgrima | San Salvador de Jujuy | 23 de Agosto |
| Independiente Rivadavia | Mendoza | Bautista Gargantini |
| Instituto | Córdoba | Presidente Perón |
| Olimpo | BahÃa Blanca | Roberto Natalio Carminatti |
| Platense | Florida | Ciudad de Vicente López |
| Quilmes | Quilmes | Centenario |
| San MartÃn | San Juan | Ing. Hilario Sánchez |
| San MartÃn | San Miguel de Tucumán | La Ciudadela |
| Sportivo Italiano | Ciudad Evita | Republica de Italia |
| Tiro Federal | Rosario | FortÃn de Ludueña |
| Unión | Santa Fe | 15 de Abril |
Standings
Promotion/Relegation Playoff Legs Primera División-Primera B Nacional
The 3rd and 4th placed of the table played with the 18th and the 17th placed of the Relegation Table of 2009–10 Primera División.!colspan="5"|Promotion playoff 1
!colspan="5"|Promotion playoff 2
Relegation
Note: Clubs with indirect affiliation with AFA are relegated to the Torneo Argentino A, while clubs directly affiliated face relegation to Primera B Metropolitana. Clubs with direct affiliation are all from Greater Buenos Aires, with the exception of Newell's, Rosario Central, Central Córdoba and Argentino de Rosario, all from Rosario, and Unión and Colón from Santa Fe.The bottom two teams of this table face relegation regardless of their affiliation status. Apart from them, the bottom teams of each affiliation face promotion/relegation playoffs against Torneo Argentino A and Primera B Metropolitana's "Reducido" champions. The Reducidos are played after those leagues' champions are known.
Updated as of games played on June 18, 2010.
Source:
Relegation Playoff Legs
!colspan="5"|Relegation/promotion playoff 1!colspan="5"|Relegation/promotion playoff 2
- Deportivo Merlo remained in the Primera B Nacional by winning the playoff.
- CAI remained in the Primera B Nacional by winning the playoff.