Flag of Bougainville
| Use | Civil and state flag |
|---|---|
| Proportion | 2:3 |
| Adopted | 1975 |
| Design | Red and white upe headdress superimposed on a green and white kapkap, on a field of cobalt blue. |
| Designed by | Jonathan Havini Marilyn Havini Moses Havini |
The flag of Bougainville (Tok Pisin: plak bilong Bogenvil) is a symbol of the Autonomous Region of Bougainville in Papua New Guinea. It was originally adopted in 1975 by the secessionist Republic of the North Solomons.