2003 Torneo Apertura (Chile)
| Dates | 8 February – 6 July 2003 |
|---|---|
| Champions | Cobreloa 6th title |
| 2004 Copa Libertadores | Cobreloa |
| 2003 Copa Sudamericana | Universidad Católica (Pre-Sudamericana winners) Provincial Osorno (Pre-Sudamericana winners) |
| Matches played | 146 |
| Goals scored | 489 (3.35 per match) |
| Top goalscorer | Salvador Cabañas (18 goals) |
| Biggest home win | Universidad de Concepción 8–2 Palestino (20 April) |
| Biggest away win | Palestino 1–5 Audax Italiano (15 March) |
| Highest attendance | 40,000 Colo-Colo 0–0 Cobreloa (21 December) |
| Total attendance | 920,914 |
| Average attendance | 6,264 |
← 2002–C 2003–C → | |
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.