The Gave de Pau (French pronunciation: [ɡav də po]) is a river of south-western France.

The river is 181.3 kilometres (112.7 mi) long (190.7 kilometres (118.5 mi) including the Gaves réunis),[1] and although its source is considered to be on the Cirque de Gavarnie in the Pyrenees mountains waters feed it from the slopes of Monte Perdido in Spain.

From the Lago Helado on the slopes of Perdido water works through a cave system to emerge from the Resurgence Brulle via the Grotte Devaux on the French side of the border.

The Gave de Pau flows through the following départements and towns:

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