Bajo Aragón (Spanish: [ˈbaxo aɾaˈɣon]; Aragonese: Baxo Aragón; Catalan: Baix Aragó), or Lower Aragon, is an administrative comarca in eastern central Aragon, Spain.

It is located in Teruel Province, in the transitional area between the Iberian System and the Ebro Valley.

The name Bajo Aragón, Lower Aragon, was already used before 1999 for a much larger area, a historical region now sometimes called Bajo Aragón histórico in order to differentiate it from the present-day administrative comarca.

The Catalan version of the names of the towns are in brackets.

This article about a location in the Province of Teruel is a stub.