Viga River (Russian: Вига) is a river in Kostroma Oblast in Russia, a right tributary of the Unzha River. It is 175 kilometres (109 mi) long, and its basin convers 3,360 square kilometres (1,300 sq mi).
Coordinates: 59°13′44″N 43°40′46″E / 59.22889°N 43.67944°E