Longstone, Isles of Scilly

Longstone is small settlement on the island of St Mary's, the largest of the Isles of Scilly, England. Nearby is Holy Vale and Rocky Hill. Longstone is located inland, at the approximate geographic centre of the island.

In Longstone is Carreg Dhu Garden, a publicly-accessible 1.5 acres (0.61 ha) garden set in a former quarry, maintained by volunteers. Until recently there was also a Heritage Centre at Longstone, but this is currently (as of 2015) closed and is proposed to become bunkhouse accommodation for educational institutions (e.g. schools, universities).