Thorn Island (alternative spelling: "Thorne Island") is a rocky islet, part of the Community of Angle off the coast of Pembrokeshire in south west Wales. It has an area of 2-acre (8,100 m2). The island is dominated by a coastal artillery fort that was built to defend Milford Haven in the mid-19th century. It has been the site of a number of shipwrecks, including one in 1894 that was carrying a cargo of Scotch whisky.