The Pitcairn Islands (; 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 last British Overseas Territory in the Pacific. The four islands – Pitcairn, Henderson, Ducie, and Oeno – are spread over several hundred miles of ocean and have a total land area of about 47 square kilometres (18 sq mi). Only Pitcairn, the second-largest island that measures about 3.6 kilometres (2.2 mi) from east to west, is inhabited.
The islands are inhabited mostly by descendants of nine Bounty mutineers and the Tahitians (or Polynesians) who accompanied them, an event that has been retold in many books and films. This history is still apparent in the surnames of many of the islanders. With only about 50 permanent inhabitants, originating from four main families, Pitcairn is the least populous national jurisdiction in the world.