| João Vieira | |
| Pushpin Map: | Guinea-Bissau |
| Pushpin Map Caption: | Location in Guinea-Bissau |
| Location: | Atlantic Ocean |
| Coordinates: | 11.0333°N -53°W |
| Archipelago: | Bijagós Islands |
| Country: | Guinea-Bissau |
| Country Admin Divisions Title: | Region |
| Country Admin Divisions Title 1: | Sector |
| Country Admin Divisions 1: | Bubaque |
| Population: | 6 |
| Population Footnotes: | [1] |
João Vieira is an island in the Bijagós Archipelago of Guinea-Bissau. Its population is 6 (2009 census).[1] It is part of the João Vieira and Poilão Marine National Park.[2] It lies 11abbr=onNaNabbr=on north-northeast of the island Poilão. Other nearby islands are Meio and Cavalos. The islands are important nesting grounds for sea turtles.[2]