Markha (; , Marxa örüs) is a river in the Sakha Republic in Russia. It is a left tributary of the Vilyuy (in the drainage basin of the Lena). The Markha is long, with a drainage basin of . Its average discharge is .
The river has its sources on the Vilyuy Plateau, a part of the Central Siberian Plateau. It joins the left bank of the Vilyuy from its mouth.