Eidfjordvatnet (English: Lake Eidfjord)[1][2][3] is a moraine-dammed lake in the municipality of Eidfjord in Vestland county, Norway.

The 3.55-square-kilometre (1.37 sq mi) 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.