The Bishop of the Isles or Bishop of Sodor was the ecclesiastical head of the Diocese of the Isles (or Sodor), one of Scotland's thirteen medieval bishoprics. The bishopric, encompassing both the Hebrides and Mann, probably traces its origins as an ecclesiastical unity to the careers of Olaf, King of the Isles, and Bishop Wimund. Previously, there had been numerous bishoprics and recorded bishoprics include Kingarth, Iona, Skye and Mann. There were very likely numerous others.

Kingarth was a church on the Isle of Bute, supposedly founded by Saint Chattan and Saint Blane. Three abbots are known, but only two bishops. Sadly, little is known about the abbey, bishopric and individual clerics.

The bishopric of the Isles became divided, primarily because the see became divided between the kings of England and Scotland. The English had taken over Mann, leaving the other islands to the north under Scottish overlordship.