Flávio César Resende Gualberto is a Brazilian professional volleyball player who plays as a middle blocker for Sir Safety Perugia and the Brazil national team.

The Brazil men's national volleyball team is governed by the Confederação Brasileira de Voleibol (Brazilian Volleyball Confederation) and takes part in international volleyball competitions. Brazil has won three gold medals at the Olympic Games, has won the World Championship three times, and the World League nine times. Brazil is the national volleyball team that has won the most titles overall, and also the team that has won most titles outside their regional competition. The team is sometimes referred to as volleyball's "Dream Team" specially in reference to its winning streak period under coach Bernardo Rezende. Currently Brazil is ranked fifth on the FIVB World Rankings.