The Pitcairn Islands ( PIT-kairn; Pitkern: Pitkern Ailen), officially Pitcairn, Henderson, Ducie and Oeno Islands, are a group of four volcanic islands in the southern Pacific Ocean that form the sole British Overseas Territory in the Pacific Ocean. The four islands—Pitcairn, Henderson, Ducie and Oeno—are scattered across several hundred kilometres (miles) of ocean and have a combined land area of about 47 square kilometres (18 square miles). Henderson Island accounts for 86% of the land area, but only Pitcairn Island is inhabited. The inhabited islands nearest to the Pitcairn Islands are Mangareva (of French Polynesia), 688 km (428 miles) to the west, as well as Easter Island, 1,929 km (1199 miles) to the east.
The Pitcairn Islanders are descended primarily from nine British HMS Bounty mutineers and twelve Tahitian women. In 2023, the territory had a permanent population of 35, making it the smallest territory in the world by number of permanent residents. Owing to the island's extreme isolation and small population, incidents of widespread sexual abuse went undetected until 1999, culminating in a high-profile sexual assault trial in 2004.