List of Breton saints

Before the Bretons came, the land now known as Brittany was known as Armorica within the Roman province of Gallia Lugdunensis. The earliest saint associated with this region is Saint Anne, mother of Mary (mother of Jesus), said by tradition to have been Armorican, and she is the patroness of Brittany. She also appeared to Yves Nicolazic, to whom she spoke in Breton.

After her, the earliest saints in what is now Brittany have dates which are sometimes unclear, but tradition holds they go back to the earliest days of the Church. One Saint Maxime, said to have been the disciple of Saint Philip the Apostle, was sent to preach among the Gauls and was made the first Bishop of Rennes. He may have been accompanied by saints by the names of Clarus and Justus. Pope Saint Linus, the second Bishop of Rome, sent Saints Clair and Adeodatus; this is said to be the Saint Clair who became the first Bishop of Nantes around AD 280 and died early in the third century, though the dates make this suspect, and Saint Adeodatus preached especially in the area of Vannes. Other Armorican saints include Saint Similien, the third Bishop of Nantes in the early fourth century, and the brother-martyrs saints Donatian and Rogatian. Saint Palladius may also have had an Armorican connection.

The Bretons, coming from the British Isles, brought Christianity with them. With the coming of the Bretons, the seven ancient dioceses were established by the seven founding saints.

• Tudwal founded Tréguier
• Pol Aurelian founded Saint-Pol-de-Leon
• Brioc founded Saint-Brieuc
• Malo founded Saint-Malo
• Patern founded Vannes
• Corentin founded Cornouailles
• Samson founded Dol

The other two dioceses of Brittany were founded by Saint Clair de Nantes and Saint Maxime de Rennes.

The "modern" in modern saints refers to the process, not the person, and groups those whose status has been recognized by Rome.

• Fr. Corentin Cloarec, OFM, killed by the Nazis
• Joachim Nio, OMI, killed by the Gestapo

• List of Welsh saints, many of whom shared Breton connections.
• List of saints of the Canary Islands

• "The Catholic Encyclopedia"
• "Hagiography Circle"
• M. de Garaby, Vie des bienheureux et des saints de Bretagne, éd. J.-M. Williamson, Nantes, 1839. Réédition 1991.
• P.T. de S. Luc, C. L'Histoire de Conan Mériadec Qui Fait le Premier regne de l'histoire generale des souverains de la Bretagne Gauloise, dite Armorique. Paris, 1664.