Listed below are the dates and results for the 1986 FIFA World Cup qualification rounds for the South American zone (CONMEBOL). For an overview of the qualification rounds, see the article 1986 FIFA World Cup qualification.
A total of 10 CONMEBOL teams entered the competition. The South American zone was allocated 4 places (out of 24) in the final tournament.
South America's qualifying berths were taken by Argentina, Uruguay, Brazil and Paraguay.
The 10 teams were divided into 3 groups. The teams played against each other on a home-and-away basis. The number of teams and spots for each group were as follows:
In the Play-offs, the 4 teams played a in knockout tournament, with matches on a home-and-away basis. The tournament winner would qualify.
Paraguay won 4–2 on aggregate and advanced to the Final Round.
Chile won 5–2 on aggregate and advanced to the Final Round.
Paraguay won 5–2 on aggregate and qualified for the World Cup.