Lac d'Aubert is a lake in Hautes-Pyrénées, France.
Description Lac d'Aubert is a crescent-shaped natural lake fed by the glaciers of Ramougn and Chaussenque, as well as overflow from the nearby Lac d'Aumar. It is at an elevation of and its surface area is . It has a maximum depth of . The lake can store of water behind a dam, which acts as a reservoir for the Lac de Cap-de-Long. Its outflow empties into other lakes, including Lac d'Orédon.
Its name means "green water" in the Occitan language.
Location The lake is in the Néouvielle National Nature Reserve, which is one of the oldest nature reserves in France, established in 1936. It contains around 70 lakes. It is one of a pair of lakes with Lac d'Aumar and is surrounded by the highest mountain pine forest in Europe. The walk between the dam on Lac d'Orédon and Lac d'Aubert takes 1½ hours.
Ecology During work by EDF at the dam at Lac d'Aubert in 2014, Bonnal's lizards found on the southern slope were relocated to a nearby protected area.
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