2009 Campeonato Nacional Primera División

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The 2009 Primera División season in Chile was the 78th edition of the top-flight football league. The competition was split into two championships, Apertura (opening) and Clausura (closing). The number of teams was reduced from 20 to 18 this season.

Format and teams
- The season used a single Classification Stage, with the top eight teams advancing to the playoff rounds. Groups were no longer used to decide advancement.
- Relegation was decided by an aggregate table from both the Apertura and Clausura. The 17th and 18th teams were automatically relegated to the Primera B. The 15th and 16th placed teams faced relegation/promotion playoffs against two teams from the 2009 Primera B: Palestino vs San Marcos de Arica, and Curicó Unido vs San Luis. The team with the most points over two legs stayed in or was promoted to the Primera División.
- Relegated last season and new teams: Antofagasta, Osorno, Melipilla, and Deportes Concepción were relegated to Primera B; Municipal Iquique and Curicó Unido were promoted to replace them.

Season details
- Apertura ran from January 31 to June 28, 2009.
- Clausura ran from July 12 to December 16, 2009.
- Total matches: 334
- Total goals: 971 (about 2.91 per match)

Champions
- Apertura champion: Universidad de Chile
- Clausura champion: Colo-Colo

Continental competition qualifications
- Copa Libertadores qualifiers: Universidad de Chile, Colo-Colo, and Universidad Católica qualified for the 2010 Copa Libertadores.
- Copa Sudamericana qualifiers: Unión Española and Universidad de Chile earned spots for the 2009 Copa Sudamericana. Universidad de Chile claimed the Chile 2 berth after a playoff against Universidad de Concepción.

Top scorers
- Apertura top scorer: Esteban Paredes with 17 goals
- Clausura top scorer: Diego Rivarola with 13 goals
- Season total top scorer: Esteban Paredes with 25 goals

Notes
- Universidad de Chile earned a place in the 2010 Copa Libertadores Second Stage.
- Colo-Colo also qualified for the 2010 Copa Libertadores Second Stage.
- The Chile 2 berth for the 2009 Copa Sudamericana came via a playoff between the Classification Stage’s second-placed team (Universidad de Chile) and the 2008 Copa Chile champions (Universidad de Concepción).