Lac d'Espingo, Natural mountain lake in Haute-Garonne, France

Lac d'Espingo is a natural mountain lake in the Haute-Garonne, at 1,882 m altitude and 7.6 ha in area, between Lac d'Oô and Lac du Portillon in the upper Oô valley. It receives water from Lac Saussat, 500 m to the southeast, and the Espingo refuge stands above it to the southeast near the col d'Espingo (1,967 m).

In 1836, geologist James David Forbes documented the presence of mica deposits around Lac d'Espingo, contributing to the early understanding of the region's mineral composition and geological characteristics.

The lake lies on the summer pasture (estive) of Oô, covering about 1,800 hectares for sheep and 700 hectares for cattle. The Espingo refuge, staffed in summer, stands above the lake to the southeast near the Col d'Espingo at 1,967 m.

From the auberge-refuge at Lac d'Oô, follow the GR10 along the lake's eastern shore, then leave it and climb to the Col d'Espingo (1,967 m); the lake lies southwest of the pass, about 80 m below it. The Espingo refuge above the lake is staffed in summer.

In 1940, researcher Henri Gaussen recorded that Lac d'Espingo receives about 59 inches (1.5 meters) of annual rainfall, making it one of the wettest high-altitude sites in the Pyrenees region.