Bajo Aragón (Spanish: [ˈbaxo aɾaˈɣon]; Aragonese: Baxo Aragón; Catalan: Baix Aragó), or Lower Aragon, is an administrative comarca in eastern central Aragon, Spain. It was first established in 1999. It has a population of 29,358 (2007) and an area of 1.304,2 km. The seat of the comarca is in Alcañiz. It is located in Teruel Province, in the transitional area between the Iberian System and the Ebro Valley.
The municipalities of Aguaviva, Belmonte de San José, La Cañada de Verich, La Cerollera, La Codoñera, La Ginebrosa and Torrevelilla belong to the Catalan-speaking strip in eastern Aragon known as La Franja.