Eiavatnet is a lake in Rogaland county, Norway. The 4.29-square-kilometre (1.66 sq mi) lake is located on the border of the municipalities of Eigersund and Sokndal, about 15 kilometres (9.3 mi) east of the town of Egersund. The lake is regulated at an elevation of 139 metres (456 ft) so it can be used as a reservoir for the Lindland Power Station which is located a short distance north of Hauge in Sokndal. The lake Grøsfjellvatnet lies about 1 kilometre (0.62 mi) north of this lake.

• List of lakes in Norway