Dogfan, also known as Doewan, was a catholic saint and martyr who lived in 5th century Wales.
He is the patron saint of Llanrhaeadr-ym-Mochnant in Wales. The town may have been the birthplace of his mother. He was also one of the sons of king Brychan.
He is said to have been put to death by Anglo-Saxon heathen invaders in Pembrokeshire, where a church was built to his memory. His feast day is 13 July.