Paul Aurelian (also known, in French, as Pol de Léon and, in Latin, as Paulinus Aurelianus) is a 6th century Welsh saint, who became one of the seven founder saints of Brittany.

His hagiographic Life was completed in 884 by a Breton monk named Wrmonoc of Landévennec:

Paul was the son of a Welsh chieftain named Perphirius, from Penychen in Glamorgan (although this is probably due to confusion with King Paul Penychen). He was also brother of three saintly sisters, Juthwara, Sidwell and Wulvela. Paul became a pupil of Saint Illtud at Llantwit Major and on Caldey Island, like Saints Samson of Dol, Gildas and David.

He later visited King Mark of Cornwall and founded the church at Paul, before moving on to Brittany to establish monasteries at Lampol on the island of Ouessant, on the island of Batz (where he later died) and at Ocsimor, now the city of Saint-Pol-de-Léon in Finistère. He was consecrated bishop there under the authority of Childebert, King of the Franks.

He was first buried at Saint-Pol-de-Léon, but his relics were later transferred to Fleury near Orleans, hence his last name, 'Aurelian'. His bell is still kept at Saint-Pol however. G. H. Doble thought he might be the same man as Saint Paulinus of Wales. His feast day is 12 March.