João Vieira
João Vieira may refer to:

João Vieira (island), an island of the Bijagós archipelago (Guinea-Bissau)
João Vieira (triple jumper) (born 1919), Portuguese triple jumper
João Bernardo Vieira (1939–2009), Guinea-Bissau general and president
João Bernardo Vieira II (born 1977), Guinea-Bissau politician
João Vieira (racewalker) (born 1976), Portuguese race walker
João Vieira (footballer, born 1991), Portuguese footballer

Vieira, João