Billy Mitchell is a pyroclastic shield in the central part of the island of Bougainville, just north-east of the Bagana Volcano in Papua New Guinea.

It is a small pyroclastic shield truncated by a 2 km wide caldera filled by a crater lake.

The 1580 AD ± 20 years eruption produced pyroclastic flows and probably formed its caldera.

[1] Billy Mitchell caldera lake is about 1,013 m above sea level, has total surface area 3 km2 (1.2 sq mi), and the maximum depth approximately 88.3 m. The only fish species in the lake is the eel Anguilla megastoma.

This Autonomous Region of Bougainville geography article is a stub.