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 João Vieira (footballer, born 1997), Brazilian footballer