The Mamakan (Russian: Мамакан) is a river in Irkutsk Oblast, southern East Siberia, Russia.

[1][2][3][4] The Mamakan reservoir, the world's first hydroelectric power plant built on permafrost, is located in the lower course of the river, about 10 kilometres (6.2 mi) from Bodaybo.

It cuts across the Delyun-Uran Range (Делюн-Уранский хребет) and flows northwards.

Finally near the Mamakan settlement it meets the Vitim 282 kilometres (175 mi) from its mouth in the Lena.

This article related to a river in the Russian Far East is a stub.