| Competition: | Campeonato Nacional 1990 |
| Dates: | 14 July 1990 – 13 January 1991 |
| Winners: | Colo-Colo (17th title) |
| Relegated: | Deportes Iquique Huachipato |
| Matches: | 240 |
| Total Goals: | 685 |
| Continentalcup1: | 1991 Copa Libertadores |
| Continentalcup1 Qualifiers: | Colo-Colo Deportes Concepción (Liguilla winners) |
| League Topscorer: | Rubén Martínez (22 goals) |
| Highest Attendance: | 60,941 |
| Attendance: | 1,820,790 |
| Average Attendance: | 7,587 |
| Prevseason: | 1989 |
| Nextseason: | 1991 |
The 1990 Campeonato Nacional, was the 58th season of top-flight football in Chile. Colo-Colo won its seventeenth title.[1] Deportes Concepción, as Liguilla winners, also qualified for the next Copa Libertadores .
| Rank | Name | Club | Goals | ||
|---|---|---|---|---|---|
| align=center | 1 | Rubén Martínez | Colo-Colo | 22 | |
| align=center | 2 |  Gustavo De Luca | Deportes La Serena | 19 | |
| align=center | 3 | Aníbal González | O'Higgins | 17 | |
| align=center | 3 | Gerardo Reinoso | Universidad Católica | 17 | |
| align=center | 5 | Juan González | Unión Española | 16 | |
| align=center | 5 | Richard Zambrano | Unión Española | 16 | |
| align=center | 7 | Adrián Czornomaz | Cobreloa | 14 |
--------Deportes Concepción also qualified for the 1991 Copa Libertadores
--------Everton and Deportes Antofagasta (after Naval was dissolved); will play in the 1991 Primera División