The Mogocha (Russian: Могоча) is a river in Krasnokholmsky, Molokovsky, and Bezhetsky Districts of Tver Oblast in Russia. Together with the Melecha River, it forms the Osen, a major right tributary of the Mologa River. It is 106 kilometres (66 mi) long, and the area of its basin is 1,880 square kilometres (730 sq mi). The principal tributaries of the Mogocha are the Uyvesh River (left) and the Loyka River (right).