The 2009 Campeonato Nacional de Apertura Copa Banco Estado was the 85th season of top-tier football in Chile.
The tournament champion was Universidad de Chile, so that earned their 13th league title after a five-year winless, after winning over Unión Española on points, in the finals, that allowed the automatically qualification of the university team to the 2010 Copa Libertadores Second Stage.
After the relegations of Deportes Melipilla, Provincial Osorno and Deportes Concepción (because administration problems), the number of teams that contested the tournament was reduced from 20 to 18, following the promotion of Curicó Unido, which made their first top-flight appearance in 35 years.
It began on 31 January during a 2–2 draw between Curicó Unido and Colo-Colo at the Estadio Fiscal de Talca, and ended on 28 June.
Universidad de Chile qualified to the 2010 Copa Libertadores Second Stage.