South American junior records in the sport of athletics are ratified by the Atletismo Sudamericano.
Athletics records comprise the best performance of an athlete before the year of their 20th birthday.
Technically, in all under 20 age divisions, the age is calculated "on December 31 of the year of competition"[1] to avoid age group switching during a competitive season.
Key to tables: Awaiting ratification Record not kept by Atletismo Sudamericano Not ratified or later rescinded by Atletismo Sudamericano