Lake Varna (Bulgarian: Варненско езеро, Varnensko ezero) is the largest by volume and deepest liman or lake along the Bulgarian Black Sea Coast, divided from the sea by a 2 km-wide strip of sand and having an area of 19 km2, maximal depth 19 m, and a volume of 166 million m3.

The lake has an elongated shape, its south shores are high, steep and wooded, and the north slant.

Lake Varna was formed in a river valley by the raising of sea level near the end of the Pleistocene.

In 1976, when a new 12 m-deep canal crossed by the Asparuhov most began operating, the lake was dredged along the stream.

Industrialization came at the cost of the lake's reputation of a rich fishing ground that had sustained human settlements for nearly 100,000 years.