| Hargy | |
| Elevation M: | 1148 |
| Location: | New Britain, Papua New Guinea |
| Coordinates: | -5.55°N 151.0167°W |
| Map: | Papua New Guinea |
| Type: | Stratovolcano |
| Volcanic Arc: | Bismarck volcanic arc |
| Last Eruption: | 950 CE |
Hargy is a large volcanic caldera on the island of New Britain, Papua New Guinea. The caldera measures by, and its floor is located at above sea level. It also hosts an inner-caldera with a steep west-facing wall. Lake Hargy, located within the caldera, drains through a narrow river that runs along the northern wall. The caldera-forming eruption occurred approximately 11,000 years ago (5050 BCE). At the western part of the caldera rises Galloseulo, a post-caldera dacitic lava cone with a -wide crater, occupied by a pair of smaller craters. Galloseulo has produced many small eruptions in the past 7,000 years, with the most recent in 950 CE.[1] In September 1990, minor fumarolic activity was observed in the western summit crater of Galloseulo.[2]