The Mologa (Russian: Моло́га) is a river in Maksatikhinsky, Bezhetsky, Lesnoy, and Sandovsky Districts of Tver Oblast, Pestovsky District in Novgorod Oblast, and Ustyuzhensky and Cherepovetsky Districts in Vologda Oblast Russia. It is a left tributary of the Volga. The lower course of the Mologa has been turned into the Rybinsk Reservoir. It is 456 kilometres long, and the area of its basin 29,700 square kilometres. The principal tributaries of the Mologa are the Osen (right), the Volchina (left), the Kobozha (left), the Chagodoshcha (left) and the Sit (it is now a tributary of the Rybinsk Reservoir).
