The Archdiocese of Nidaros was the metropolitan see covering Norway in the later Middle Ages. The see was the Nidaros Cathedral, in the city of Nidaros. The archdiocese existed from the middle of the twelfth century until the Protestant Reformation.

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.