Bagana is an active volcano located in the centre of the island of Bougainville, Papua New Guinea, the largest island of the Solomon group. It is the most active volcano in the country.
Just north-east of Bagana is the volcano crater lake Billy Mitchell. Bagana is one of 17 post-Miocene strato volcanos on Bougainville. U.S. General Floyd L. Parks flew over the Solomon Islands on 27 October 1948 and witnessed the eruption of Bagana. His photographs of Bagana erupting were published in Life magazine.