Eidfjordvatnet is a moraine-dammed lake in the municipality of Eidfjord in Hordaland county, Norway. The 3.55-square-kilometre (1.37 sq mi) lake is located immediately southeast of the village of Eidfjord. The village of Øvre Eidfjord lies on the southern shore of the lake. The Norwegian National Road 7 runs along the western shore of the lake. The water enters the lake through the rivers Bjoreio and Veig, and the water empties from the lake through the river Eio.