Eidfjordvatnet is a moraine-dammed lake in the municipality of Eidfjord in Vestland county, Norway. The 3.55 km2 lake is located immediately southeast of the village of Eidfjord. Øvre Eidfjord village lies on the southern shore of the lake. Norwegian National Road 7 runs along the western shore of the lake. The water enters the lake through the Bjoreio and Veig rivers, and the water empties from the lake through the Eio River.