The 2012 Primera División del Fútbol Profesional Chileno season (known as the 2012 Campeonato Nacional Petrobras for sponsorship reasons) was the 81st season of top-flight football in Chile. Universidad de Chile is the defending champion. Universidad de Chile won both the Apertura and the Clausura Championships
For the 2012, the ANFP's Council of Club Presidents approved the return to the Apertura and Clausura format, with playoffs.
Eighteen teams competed in the Primera División for the 2012 season, sixteen of whom returned from the 2011 season. Santiago Morning and ÃÂublense were relegated last season after finishing 17th and 18th overall, respectively. There were replaced by Antofagasta and Rangers, the 2011 Primera B winner and runner-up, respectively. In 2012, the Santiago Wanderers celebrated their 120th season since the teams founding in 1892.
The Torneo Apertura began in January and will ended on July 2.
The Classification Stage began in January and ended in July.
<onlyinclude></onlyinclude>
<onlyinclude></onlyinclude>
In the quarterfinals, the 1 seed play the 8 seed, the 2 seed play the 7 seed, the 3 seed play the 6 seed, and the 4 seed play the 5 seed.
In the semifinals, the highest seed play the lowest seed, and the second-highest seed play the second-lowest seed.
Universidad de Chile won 4âÂÂ2 on aggregate.
2âÂÂ2 on aggregate. O'Higgins won on away goals rule.
3âÂÂ3 on aggregate. Universidad de Chile won on penalties.
The Torneo Clausura began in July and will end in December.
<onlyinclude></onlyinclude>
<onlyinclude></onlyinclude>
Colo-Colo won 6âÂÂ5 on aggregate.
Unión Española won 4âÂÂ1 on aggregate.
Huachipato won 3âÂÂ2 on aggregate.
Rangers won 2âÂÂ0 on aggregate.
Unión Española won 5âÂÂ1 on aggregate.
Huachipato won 2âÂÂ1 on aggregate.
4âÂÂ4 on aggregate. Huachipato won 3âÂÂ2 on penalties.
Everton won 4âÂÂ1 on aggregate and is promoted to Primera División. Universidad de Concepción is relegated to Primera B.
Cobresal won 4âÂÂ3 on aggregate and remains in Primera División. Barnechea remains in Primera B.