Jasa is a municipality in the province of Huesca, in the autonomous community of Aragon, Spain. It is a small Pyrenean locality in the comarca of Jacetania, in the far north of Aragon near the French border.
According to the 2004 census (INE), the municipality had a population of 128 inhabitants. Its population is spread across the municipal area, which includes the main village and the hamlets of Novés and San Martín de la Val d'Onsera.
Jasa is known for the Sanctuary of the Virgin of the Way (Santuario de Nuestra Señora de la Victoria), a pilgrimage site in the mountains above the village, and for the ruins of the monastery of San Martín de la Val d'Onsera, reached by a mountain trail.