| Bajo Aragón | |
| Other Name: | Lower Aragon |
| Native Name: | |
| Settlement Type: | Comarca |
| Subdivision Type: | Country |
| Subdivision Name: |  Spain |
| Subdivision Type1: | Autonomous community |
| Subdivision Name1: | Aragón |
| Subdivision Type2: | Province |
| Subdivision Name2: | Teruel |
| Seat Type: | Capital |
| Seat: | Alcañiz |
| Parts Type: | Municipalities |
| Parts Style: | list |
| P1: | See text |
| Area Total Km2: | 1304.2 |
| Population Total: | 30146 |
| Population As Of: | 2008[1] |
| Population Density Km2: | auto |
| Population Demonym: | bajoaragonés/a |
| Blank Name Sec1: | Largest municipality |
| Blank Info Sec1: | Alcañiz |
| Timezone1: | CET |
| Utc Offset1: | +1 |
| Timezone1 Dst: | CEST |
| Utc Offset1 Dst: | +2 |
| Area Code Type: | Dialing code |
Bajo Aragón (pronounced as /es/; an|Baxo Aragón; ca|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 km2. 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.
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.