João Vieira may refer to:
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João Vieira (island), an island of the Bijagós archipelago (Guinea-Bissau)
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João Vieira (triple jumper) (born 1919), Portuguese triple jumper
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João Bernardo Vieira
João Bernardo "Nino" Vieira (; 27 April 1939 – 2 March 2009) was a Bissau-Guinean politician and military officer who served as President of Guinea-Bissau from 1980 to 1999, except for a three-day period in May 1984, and from 2005 until ...
(1939–2009), Guinea-Bissau general and president
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João Bernardo Vieira II (born 1977), Guinea-Bissau politician
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João Vieira (racewalker) (born 1976), Portuguese race walker
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João Vieira (footballer, born 1991), Portuguese footballer
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João Vieira (footballer, born 1997), Brazilian footballer
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Vieira, João