The Bishop of Orkney was the ecclesiastical head of the Diocese of Orkney, one of thirteen medieval bishoprics of Scotland. It included both Orkney and Shetland. It was based for almost all of its history at St Magnus Cathedral, Kirkwall.

St Magnus Cathedral dominates the skyline of Kirkwall, the main town of Orkney, a group of islands off the north coast of mainland Scotland. It is the oldest cathedral in Scotland, and the most northerly cathedral in the United Kingdom, a fine example of Romanesque architecture built for the bishops of Orkney when the islands were ruled by the Norse Earls of Orkney. It is owned not by the church, but by the burgh of Kirkwall as a result of an act of King James III of Scotland following Orkney's annexation by the Scottish Crown in 1468. It has its own dungeon.