The 31st South American Junior Championships in Athletics were held in Concepción, Chile from October 22–23, 1999.

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

[1] An unofficial count yields the number of about 278 athletes from about 11 countries: Argentina (47), Bolivia (9), Brazil (63), Chile (59), Colombia (15), Ecuador (30), Panama (4), Paraguay (4), Peru (15), Uruguay (10), Venezuela (22).

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 (Chile)