Fayón (also known as Faió) is a municipality in the province of Zaragoza, in the Aragon region of Spain. It lies in the comarca of Bajo Aragón-Caspe, in the area known as La Franja, near the border with Catalonia.
The town is situated between the Ebro and Matarranya rivers. Its location in La Franja means that the local dialect is a variant of Catalan, rather than Castilian Spanish.
According to the 2004 census (INE), Fayón had a population of 395 inhabitants.