Ardisa is a municipality and town in Spain, in the Cinco Villas region, belonging to the judicial district of Ejea de los Caballeros, northwest of the province of Zaragoza, autonomous community of Aragon, 70 km from Zaragoza. It has an area of 27.18 km² with a population of 72 inhabitants (INE 2016) and a density of 2.65 inhab/km².
It borders to the north with Santa Eulalia de Gállego (belonging to the Hoya de Huesca region, in the province of Zaragoza), to the east with Biscarrués, to the south with Puendeluna and to the west with Luna.
The nucleus of Sierra de los Blancos is included in its municipal term, as well as that of Casas de Esper.
Ardisa belongs to the Cinco Villas Region. Previously it belonged to La Hoya de Huesca.
Its parish church stands out, which preserves an altarpiece of San Juan Bautista from the 15th century and the Hermitage of the Virgin of Miramonte.
Nearby is the Ardisa Dam, built in 1932, from where the waters of the Gállego River are diverted.
