| Competition: | XV Torneo Argentino A |
| Season: | 2009–10 |
| Winners: | Patronato |
| Promoted: | Patronato |
| Relegated: | Juventud (P) Ben Hur |
| League Topscorer: | Diego Jara (26 goals) |
| Prevseason: | 2008–09 |
| Nextseason: | 2010–11 |
The 2009–10 Argentine Torneo Argentino A was the fifteenth season of third division professional football in Argentina. A total of 25 teams competed; the champion was promoted to Primera B Nacional.
| Club | City | Stadium | |
|---|---|---|---|
| Cipolletti | Cipolletti | La Visera de Cemento | |
| Guillermo Brown | Puerto Madryn | Raul Conti | |
| Huracán | Tres Arroyos | Roberto Lorenzo Bottino | |
| Juventud | Pergamino | José Raymundi | |
| Rivadavia | Lincoln | El Coliseo | |
| Santamarina | Tandil | Municipal Gral. San Martín | |
| Unión | Mar del Plata | (None) 1 | |
| Bahía Blanca | El Fortín |
1 Play their home games at Estadio José María Minella.
| Club | City | Stadium | |
|---|---|---|---|
| 9 de Julio | Rafaela | El Coloso | |
| Ben Hur | Rafaela | Parque Barrio Ilolay | |
| Crucero del Norte | Garupá | Andrés Guacurarí | |
| Gimnasia y Esgrima | Concepción del Uruguay | Manuel y Ramón Núñez | |
| Libertad | Sunchales | Hogar de Los Tigres | |
| Patronato | Paraná | Presbítero Bartolomé Grella | |
| San Francisco | Oscar Boero | ||
| Unión | Sunchales | La Fortaleza |
| Club | City | Stadium | |
|---|---|---|---|
| Alumni | Villa María | Manuel Ocampo | |
| Central Córdoba | Santiago del Estero | Alfredo Terrara | |
| Deportivo Maipú | Maipú | Higinio Sperdutti | |
| Desamparados | San Juan | El Serpentario | |
| Estudiantes | Río Cuarto | Ciudad de Río Cuarto | |
| Juventud Antoniana | Salta | Fray Honorato Pistoia | |
| Juventud Unida Universitario | San Luis | Mario Diez | |
| Racing | Córdoba | Miguel Sancho | |
| Talleres | Córdoba | La Boutique |
|-!colspan="5"|Relegation/promotion playoff 1|-!colspan="5"|Relegation/promotion playoff 2