The Bambuyka (Russian: Бамбуйка) is a river in Buryatia, southern East Siberia, Russia.

[1] The only inhabited place in the area is Bambuyka, Muysky District, a small hamlet located close to the mouth of the river.

Its sources are in a small lake close to the southwestern slope of Muisky Gigant, the highest peak of the Southern Muya Range.

The river flows first in a SSE direction across mountainous terrain.

In its lower course it bends gradually, meandering northeastwards in a floodplain, until it finally meets the left bank of the Vitim 812 kilometres (505 mi) from its mouth in the Lena.