The 4th South American Youth Championships in Athletics were held in Rio de Janeiro, Brazil from July 22–24, 1977.

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

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

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

[3] An unofficial count yields the number of about 202 athletes from about 8 countries: