Híjar is a municipality in the province of Teruel, in the autonomous community of Aragon, Spain. It is located in the eastern part of the province, within the comarca of Bajo Martín.
According to the 2023 census, the municipality had a population of 1,797 inhabitants. The town is situated in a semi-arid landscape typical of the Ebro Depression, near the confluence of the Martín and Ebro rivers.
Híjar is known for its historic old town, which retains a medieval layout and includes the remains of a castle and the church of Santa María la Mayor. The town was historically significant as the seat of the Duchy of Híjar, a title granted in the 15th century.