1991 Primera División de Chile

The 1991 Campeonato Nacional, was the 59th season of top-flight football in Chile. Colo-Colo won its eighteenth title following a 0–0 away draw against Coquimbo Unido on 18 December. Coquimbo Unido, as runner-up, and Universidad Católica, as Liguilla winners, also qualified for the next Copa Libertadores.

Preliminary round
* Qualified as "Best Loser"

Universidad Católica also qualified for the 1992 Copa Libertadores

Promotion/relegation Liguilla
Everton and Universidad de Chile will play in the 1992 Primera División