The 2012 Men's Junior South American Volleyball Championship was the 21st edition of the tournament, organised by South America's governing volleyball body, the Confederación Sudamericana de Voleibol (CSV). It was determined September, 2012 that Saquarema, Brazil would be the host after Cali, Colombia withdrew. The top three teams will qualify for the 2013 Junior World Championship.
The following national teams will participate in the tournament, teams were seeded according to how they finished in the previous edition of the tournament: