Sallent de Gállego (in Aragonese: Sallent de Galligo or Sallén de Galligo)) is a municipality located in the province of Huesca, Aragon, Spain.

The town is located in the central Pyrenees besides the reservoir of Lanuza on the foot of some of the highest summits of the chain, close to the border with France. It is part of the Alto Gállego comarca, and it is the capital of the Tena Valley.

These localities are also part of the municipality: Formigal, Portalet d'Aneu, Lanuza, Escarrilla, Tramacastilla and Sandiniés.

The Gállego river runs through the town and its first tributary, the Aguas Limpias, unites to the Gállego inside the town. Both rivers' sources are inside the municipality.

The Foratata peak (2,000 m) towers over the town, being an iconic peak for all the valley. Other important summits belonging to the municipality are Anayet, Tres Hombres, Arriel and Balaitous, many of them are over 3000 meters high. The GR 11 route that goes along all the Pyrenees goes through the municipality.

The Portalet pass that links the Tena Valley, in Spain, and the Ossau Valley, in France, is also in Sallent de Gállego.

The Formigal ski resort, a few kilometers up from the town, is the largest resort in Spain and concentrates the majority of hotels and restaurants.

According to Köppen's weather classification Sallent de Gallego has an intermediate weather between Dfc - Dfb y Cfb. The mhighest temperature was reached on the 29th of July of 1981 with 96.8 °F. The lowest temperature reached was -5.8 °F the 11th of March of 1985.

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