Salas Bajas is a municipality in the province of Huesca, in the autonomous community of Aragon, Spain. It is located in the Somontano de Barbastro comarca of northern Aragon, in the foothills of the Pyrenees.
According to the 2022 census (INE), the municipality has a population of 190 inhabitants. The village is situated close to the town of Barbastro, the comarca's administrative centre.