The Uda is a river in the Buryat Republic, Russia. It is a right tributary of the Selenga, which it meets near the city Ulan-Ude. Its length is 467 km, and it has a drainage basin of 34800 km2. The Uda basin lies in the Tuguro-Chumikanskiy region. The word Uda is derived from the Yakut word ud, meaning "milk". The name was conferred on the river owing to a nearby milk-colored lake.

Fish

The Uda is a prime habitat for the pink, chum, red, and coho salmons. Other fish species found in the Uda include the Siberian taimen, two forms of lenok, and Amur grayling. The river is especially important as it remains one of the last strongholds of taimen, which have dwindled in other Siberian rivers. Taimens grow to huge sizes here; specimens weighing 95 kg have been caught here.