The Muya is a left tributary of the Vitim in Buryatia, Russia. It is 365 km long and has a drainage basin of 11900 km2. The area through which the river flows is sparsely populated, the only settlement on the river being Taksimo, with the village of Ust-Muya located where the river flows into the Vitim, nearly opposite from the mouth of the Kuanda in the facing bank. The Muya is navigable for small craft from the Vitim around 70 km to Taksimo. The Muya has lent its name to a number of other geographic features, including the Northern Muya Range, the Southern Muya Range, the Muya-Kuanda Depression, as well as the local Muya District.

Tributaries

The longest tributary of the Muya is the 180 km long Muyakan on the left.