Elektrėnai Reservoir (Lithuanian: Elektrėnų marios), located south of the city of Elektrėnai, Lithuania, is the third-largest artificial lake in Lithuania. It was created in 1961 by damming the Strėva River. It supplies cooling water to the 1,800 MW Elektrėnai Power Plant. A number of villages drowned when the reservoir was created; over 140 households were relocated. The reservoir also covered eight other lakes.

The reservoir covers about 1,264 hectares, with depths of over 30 meters.

• Elektrėnai, Vilnius: Jandrija, 2006