Birsay (Old Norse: Birgisherað) is a parish in the north west corner of The Mainland of Orkney, Scotland. Almost all the land in the parish is devoted to agriculture: chiefly grassland used to rear beef cattle. There are various ancient monuments in the parish.
Two important ancient monuments are maintained by Historic Scotland and bring many visitors to the area in summer. These are the prehistoric and Norse settlements on the tidal island of Brough of Birsay and the ruins of the Earl's Palace on the Mainland opposite, at the northern end of the village.
On the western part of Mainland Orkney's north shore there is other evidence of prehistoric man, including the well preserved ruins of the Broch of Gurness.
The late 16th century palace was built by Robert Stewart, 1st Earl of Orkney (1533–93). Though extensively ruined, it can be seen to have consisted of four ranges round an open courtyard, with small towers at the corners, an unusual form of building in Scotland at this date, and unprecedented in the north of the country. The date 1574 was formerly carved above the main (south-facing) entrance. The building has been uninhabited since the late seventeenth century. It was originally adjoined by walled garden enclosures, an archery range and a bowling green. This building, along with the Earl's Palace in Kirkwall, and Scalloway Castle on Shetland (all Historic Scotland), were the main residences of the Stewart Earls of Orkney in the Northern Isles.