Favaios (Portuguese pronunciation: [fɐˈvajuʃ]) is a civil parish of the municipality of Alijó, in northern Portugal. The region is known for its wines, namely, the moscatels like Moscatel de Favaios.

Favaios originally was part of the region of Panoias, before being occupied by Roman legions between 218 AD and 201 AD. Lost to the tribes of Lusitanians and Hispanic clans after 200 A.D. The founders came from the families and relations of the Flavian dynasty, of Imperial Rome, who rose to prominence after Emperor Titus Flavius Caesar Vespasianus Augustus. The parishes' name is derived from Flávios, a corruption of the original Flavius of this leader. Panoias was a vast territory which extended from Marão to Tua Rivers, and from the Douro River until the municipality of Murça.

The invasion of the Iberian peninsula by Arabs reached the north, where the Moors took the Roman Castle of Flávias: it would later be remembered as the "Castelo dos Mouros” (English: Castle of Moors). This occupation forced the locals to escape the region and re-established settlements away from Favaios: half the population took refuge in the area that would be renamed São Bento. From this new colony the Portuguese battled the Moors of Favaios; after the explusion of the Moors the region was covered in the destruction of these battles. The destruction lead to a slow reconstruction of Favaios.