2005 Campeonato Nacional Primera División

The 2005 Primera División de Chile season was both 77th and 78th season of top-flight football in Chile.

Torneo Apertura

The 2005 Torneo Apertura was the season's first tournament. Cobreloa was the defending champions.

Qualification stage

Aggregate table

'''Repechaje'''

Torneo Clausura

The 2005 Torneo Clausura was the season's second tournament. Unión Española was the defending champion after beating Coquimbo Unido in the Torneo Apertura final.

Qualification stage

Aggregate table

'''Repechaje'''