João José "Pipoka" Vianna (born 15 November 1966), is a Brazilian former professional basketball player.

During his pro club career, Vianna won 5 Brazilian Championships, in the seasons 1985, 1986 (I), 1986 (II), 1987, and 2007.

Vianna also played briefly with the Dallas Mavericks of the National Basketball Association (NBA), during the 1991–92 season, becoming just the second Brazilian player to play in the NBA, after Rolando Ferreira.

[2] Vianna played for Maratonistas de Coamo in Puerto Rico from 1989 to 1991, and in 1993.

This biographical article relating to a Brazilian basketball figure is a stub.