Lac d'Estaing, Mountain lake in Hautes-Pyrénées, France.

Lac d'Estaing is a lake in the Val d'Azun, in the commune of Estaing, Hautes-Pyrénées, at an elevation of 1163 m, with a surface area of 0.086 km². A narrow dark channel winds through dry yellowish grass in the foreground toward the broad, still expanse of water, which reflects the sky. Beyond the far shore, green and brown mountain slopes rise, with patches of snow near the highest ridge.

The sources record no historical events, dates or figures for Lac d'Estaing; its documented past is limited to its name, a pleonasm since estanh already means "pond" in Gascon. The lake lies in the Val d'Azun, in the valley of Estaing, and is reached by the departmental road 103 from the village of Estaing. It is a fishing lake, with footpaths and a campsite nearby.

The lake sits along the GR10 long-distance trail, which crosses the Pyrenees from the Atlantic to the Mediterranean. In summer, hikers often stop here to rest before heading toward the surrounding peaks.

A campground right beside the lake is open during the summer months and works as a starting point for trails into the surrounding mountains. Access is easiest from June through September, when the mountain paths are generally free of snow.

The lake is home to a small group of little grebes, water birds that nest along the sheltered shoreline and are rarely spotted by passing hikers. Their calls carry clearly across the water in the early morning, often before the birds themselves come into view.