João Batista do Nascimento Carvalho (born 23 June 1979), known as Valdin, is a Brazilian futsal player who plays as a winger for Esporte Clube URCA JN and the Brazilian national futsal team.
Valdin holds the record of the most goals scored in a single international game, when he scored 20 goals in a 76-0 win over Timor-Leste in the 2006 Lusophony Games.