Shapinsay (/ˈʃæpɪnziː/, Scots: Shapinsee) is one of the Orkney Islands off the north coast of mainland Scotland. With an area of 29.5 square kilometres (11.4 sq mi), it is the eighth largest island in the Orkney archipelago. It is low-lying and, with a bedrock formed from Old Red Sandstone overlain by boulder clay, fertile. Consequently, most of the area is given over to farming. Shapinsay has two nature reserves and is notable for its bird life. Balfour Castle, built in the Scottish Baronial style, is one of the island's most prominent features, a reminder of the Balfour family's domination of Shapinsay during the 18th and 19th centuries; the Balfours transformed life on the island by introducing new agricultural techniques. Other landmarks include a standing stone, an Iron Age broch, a souterrain and a salt-water shower.
There is one village on the island, Balfour, from which roll-on/roll-off car ferries sail to Kirkwall on the Orkney Mainland. At the 2011 census, Shapinsay had a population of 307. The economy of the island is primarily based on agriculture with the exception of a few small businesses that are largely tourism-related. A community-owned wind turbine was constructed in 2011. The island has a primary school but, in part due to improving transport links with mainland Orkney, no longer has a secondary school. Shapinsay's long history has given rise to various folk tales.