Lake Volgo (Russian: Озеро Волго) is a lake in Ostashkovsky, Penovsky, and Selizharovsky Districts of Tver Oblast, Russia.

The lake has a surface area of 61 square kilometres (24 sq mi), and the area of its drainage basin is 3,500 square kilometres (1,400 sq mi).

[1] The urban-type settlement of Peno is located on the western bank of the lake.

The Volga flows out from the easternmost corner, at the selo of Selishche, where the dam of the reservoir is located.

The total length of the lake is about 30 kilometres (19 mi), the average depth is 2 metres (6.6 ft).