The Tvertsa (Russian: Тверца́) is a river in Vyshnevolotsky, Spirovsky, Torzhoksky, and Kalininsky Districts, as well as in the cities of Torzhok and Tver in Tver Oblast, Russia, a left tributary of the Volga. It is 188 kilometres long, and the area of its basin 6,510 square kilometres. The principal tributaries of the Tvertsa are the Malaya Tigma (left), the Shchegrinka (right), the Osuga (right), the Logovyazh (left), and the Kava (left).
