The Motorchuna (Russian: Моторчуна) is a river in Yakutia (Sakha Republic), Russia. It is a left tributary of the Lena with a length of 423 kilometres. Its drainage basin area is 9,250 square kilometres. Since its river basin is uninhabited, the Motorchuna is one of the most untouched rivers in Yakutia; the waters are clean and there is abundant wildlife.
In the International scale of river difficulty the Motorchuna is a Class II destination for rafting and kayaking.
The main fish species are pike, perch, lenok, taimen, grayling, burbot, whitefish and nelma, among others.
