The 23rd South American Junior Championships in Athletics were held in Asunción, Paraguay from June 21–23, 1991.

Detailed result lists can be found on the "World Junior Athletics History" website.

[1] An unofficial count yields the number of about 212 athletes from about 9 countries: Argentina (47), Bolivia (6), Brazil (58), Chile (33), Colombia (6), Ecuador (16), Paraguay (28), Peru (12), Uruguay (6).

Medal winners are published for men[2] and women[3] Complete results can be found on the "World Junior Athletics History" website.

[1] *   Host nation (Paraguay)