The 10th South American Youth Championships in Athletics were held in Lima, Peru, between November 22–24, 1990.

[1] Medal winners are published for boys[2] and girls.

[3] Complete results can be found on the "World Junior Athletics History" website.

[4] *   Host nation (Peru) Detailed result lists can be found on the "World Junior Athletics History" website.

[4] An unofficial count yields the number of about 196 athletes from about 10 countries: