The Tuba (Russian: Туба́) is a river in Krasnoyarsk Krai in Siberia in Russia. It is formed by the confluence of the rivers Kazyr (Казыр) and Amyl (Амы́л) and is a right tributary of the Yenisey.
The length of the river proper is 119 kilometres or 507 kilometres from the headwaters of the Kazyr in the Eastern Sayan Mountains in the Minusinsk Hollow. The area of its basin, which includes more than a thousand lakes, is 36,900 square kilometres.
The Tuba flows into the Krasnoyarsk Reservoir so that the mouth of the Tuba is actually part of the reservoir.
