Bajo Aragón-Caspe (Spanish: [ˈbaxo aɾaˈɣoŋ ˈkaspe]) or Baix Aragó-Casp (Catalan: [ˈbaʒ aɾaˈɣo ˈkasp]) is a comarca in eastern Aragon, bordering the Spanish Autonomous Community of Catalonia.
It borders the Aragonese comarques of Matarranya, Monegros, Bajo Cinca, Bajo Martín and Ribera Baja del Ebro, and the Catalan comarques of Terra Alta, Baix Ebre, and Ribera d'Ebre.