Budoc of Dol was a 5th-century Breton monk and Bishop of Dol, who has been venerated since his death as a saint in both Brittany and Devon. Budoc is the patron saint of Plourin in Finistère where his relics are preserved. His feast day was originally celebrated on 8 December, the date still used in Devon, but in Brittany this has been transferred to 9 December.

The Breton and French Catholic diocese of Dol existed from 848 to the French Revolution. It was suppressed by the Concordat of 1801. Its see was Dol Cathedral. Its scattered territory was shared mainly by the Diocese of Rennes and the Diocese of Saint-Brieuc.