| Competition: | Primera División |
| Season: | 2009 |
| Winners: | Apertura: Universidad de Chile Clausura: Colo-Colo |
| Relegated: | Curicó Unido Rangers Municipal Iquique |
| Matches: | 334 |
| Total Goals: | 971 |
| Continentalcup1: | Copa Libertadores |
| Continentalcup1 Qualifiers: | Universidad de Chile Colo-Colo Universidad Católica |
| Continentalcup2: | Copa Sudamericana |
| Continentalcup2 Qualifiers: | Unión Española Universidad de Chile |
| League Topscorer: | Apertura: Esteban Paredes (17 goals) Clausura: Diego Rivarola (13 goals) Season: Esteban Paredes (25 goals) |
| Prevseason: | 2008 |
| Nextseason: | 2010 |
The 2009 Primera División del Fútbol Profesional Chileno season was the 78th season of top-flight football in Chile. The season was composed of two championships: the Torneo Apertura & Torneo Clasura.
The format for 2009 remains largely the same as 2008, except for the advancement to the Playoff Stages. Groups will no longer be used to determine who advance to the next stage. Instead, the top-eight teams in Classification Stage will advance.
Qualification to the Copa Libertadores remains the same, as well as qualification to the Chile 1 spot in the Copa Sudamericana. The Chile 2 spot will be contested between the second-best team in the first stage and the 2008-09 Copa Chile winner. The winner of the single match will qualify to the 2009 Copa Sudamericana.
The number of teams were reduced starting with this season from 20 to 18. Antofagasta, Osorno, Melipilla, and Deportes Concepción were relegated last season to the Primera B. They were replaced by Municipal Iquique and Curicó Unido.
See main article: 2009 Torneo Apertura (Chile). The Torneo Apertura, officially the Campeonato Nacional de Apertura de Primera División de Fútbol Profesional (English: Apertura National Championship of the First Division of Professional Football), was the first tournament of the season. It began on January 31 and ended on June 28.
See main article: 2009 Torneo Clausura (Chile). The Torneo Clasura, officially the Campeonato Nacional de Clausura de Primera División de Fútbol Profesional (English: Clausura National Championship of the First Division of Professional Football), was the second tournament of the season. It began on July 12 and was ended on December 16.