St Magnus Church, Birsay is a 17th century church located in the parish of Birsay on Mainland, Orkney in Scotland. Built in 1664 on the site of an earlier, 11th century church, St Magnus was later expanded in 1760 and 1867. The graveyard surrounding the church dates to the 18th century. The church is now maintained by the St Magnus Church Birsay Trust.