Ederval LuÃÂs Lourenço da Conceição (born 15 October 1964), better known as Tato, is a Brazilian former professional footballer who played as a right winger.
Tato made history by scoring one of Inter de Limeira's goals against Palmeiras in the final of the 1986 Campeonato Paulista (alongside Kita), which guaranteed the first title for a countryside team in the state of São Paulo. He later played for Palmeiras, Guarani, Atlético Mineiro, União São João and Leones Negros.
Tato also played for Brazil U20 team, during the 1987 Toulon Tournament.