The Gállego is a river in Aragon, Spain, one of the main tributaries of the Ebro River. It has a watershed of over 4,000 square kilometres (1,500 sq mi), with a total length of 193.2 kilometres (120.0 mi).
The river has its source at 2,200 metres (7,200 ft) in Col d'Aneu, Pyrenees, not far from the Col du Pourtalet. It then flows in the Tena Valley through the municipalities of Sallent de Gállego, Panticosa and Biescas. Starting from Sabiñánigo it forms a wide elbow until Triste, from which it continues in its primitive north–south direction until flowing into the Ebro near Zaragoza.
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