The 21st South American Youth Championships in Athletics were held at the Parque San Martín in Mendoza, Argentina between October 26–28, 2012.

[1] Complete results can be found on the CONSUDATLE website.

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

[4] Working through the results,[5][2] an unofficial count yields the number of about 308 athletes (including 1 athlete from Costa Rica as guest) in the start list.

Following, the numbers in brackets refer to (athletes in published team roster/athletes in start list):