The 2018 Girls' Youth South American Volleyball Championship was the 21st edition of the Girls' Youth South American Volleyball Championship, organised by South America's governing volleyball body, the Confederación Sudamericana de Voleibol (CSV). The tournament will be held in Valledupar, Colombia from 8 to 12 July 2018.
A total of eight teams played in the tournament, with players born on or after 1 January 2002 eligible to participate.
Same as previous editions, the tournament acted as the CSV qualifiers for the FIVB Volleyball Girls' U18 World Championship. The top three teams qualified for the 2019 FIVB Volleyball Girls' U18 World Championship as the CSV representatives.
The following national teams participated: