| Aïgue Longue | |
| Pushpin Map: | France#France Nouvelle-Aquitaine |
| Mouth Coordinates: | 43.4433°N -0.4633°W |
| Subdivision Type1: | Country |
| Length: | 24km (15miles) |
The Aïgue Longue (or Aygue Longue) is a left tributary of the Luy de Béarn, at Mazerolles, Pyrénées-Atlantiques, in the Southwest of France. It is 24.4km (15.2miles) long.
Its name means 'long water (stream)'.
The Aïgue Longue rises in the moor of Pont-Long in the north of Pau. It flows through the lake of Uzein and joins the Luy de Béarn, 77km (48miles) upstream from Mazerolles, Pyrénées-Atlantiques, in a parallel motion with the Uzan.
A dam near Mazerolles forms a reservoir named Lac de L'Aigue Longue.