Vidra Lake is a storage reservoir, located in the Parâng Mountains group, on the Lotru River, in Vâlcea County, in south-central Romania.
The lake has an area of and a volume of .
Its associated hydroelectric plant, Lotru-Ciunget, has a maximum power output of 510 MW, using an altitude difference of about .
The dam and the hydro plant were built between 1965 and 1972. It is the second largest hydro plant in Romania, after the Iron Gates I and II power stations.