San Fagondu (Spanish: San Facundo) is one of 44 parishes (administrative divisions) in Tinéu, a municipality within the province and autonomous community of Asturias, in northern Spain.
Situated at 523m (1,716feet) above sea level, it is 12.81km2 in size, with a population of 210 (INE 2004). The postal code is 33875.