Lake Kovzhskoye (Russian: Ковжское озеро) is a freshwater lake, located in the center of Vytegorsky District of Vologda Oblast in Russia.

The area of the lake is 65 square kilometres (25 sq mi), and the area of its basin is 438 square kilometres (169 sq mi).

The lake belongs to the basins of the Volga and the Caspian Sea.

Two villages, Loza and Yakshino, are located on the southern shore of the lake.

Both are on the highway connecting Vologda with Medvezhyegorsk via Vytegra and Pudozh.