2003 Torneo Apertura (Chile)

The 2003 Campeonato Nacional Apertura Copa Banco del Estado was the 73rd Chilean League top flight tournament, in which Cobreloa won its sixth league title after eight years.

Repechaje
Santiago Wanderers qualify to playoffs as best placed team despite having drawn with Unión San Felipe.

First round
Colo-Colo and Huachipato qualified as best losers.

Pre-Copa Sudamericana 2003 Tournament
All sixteen first level teams took part in this tournament, plus -and only for this edition-, all sixteen second level teams took part as well. One of the qualified teams to the Copa Sudamericana coming from this division, Provincial Osorno.

First round
Played on July 9 & 10, 2003

Second round
Played on July 13, 2003

Third round
Played on July 16 & 17, 2003

Final round
Universidad Católica & Provincial Osorno qualified to 2003 Copa Sudamericana