The Markhachan (Russian: Мархачан) is a river of Sakha Republic, Russia, a tributary of the Lena.

[1] The river flows across sparse larch taiga in an uninhabited area of Olyokminsky District.

In the International scale of river difficulty the Markhachan is a Class III destination for rafting and kayaking.

The river heads mainly southwards along its course, parallel to the Markha in the west.

Finally it joins the left bank of the Lena 1,914 km (1,189 mi) from its mouth.