Fayón (Spanish: [faˈʝon]) or Faió (Catalan: [faˈjo]) is a municipality located in the province of Zaragoza, Aragon, Spain.

This town is located between the Ebro and the Matarranya rivers in La Franja area; the local dialect is a variant of Catalan.

Historically this town and its municipal term were considered part of the Matarraña, but presently it is included in the Bajo Aragón-Caspe comarca.

On 25 July 1938 the 42 division of the Spanish Republican Army successfully crossed the river in this area but was surrounded and massacred in the Auts hills by the rebels.

In 1955 the Cesaraugustanae et aliarum decree of the Consistorial Congregation was published and on the 2d September of the same year, Fayón, along with Mequinenza was segregated from Lleida and merged with the Archdiocese of Zaragoza.