The Miass (Bashkir: Мейәс, Meyäs) is a river on the eastern side of the Ural Mountains in Bashkortostan, Chelyabinsk Oblast and Kurgan Oblast, Russia.

It is a right tributary of the Iset, part of the Irtysh basin.

[1] It is 149 kilometres (93 mi) long, and has a drainage basin of 13,700 square kilometres (5,300 sq mi).

[2] The cities Chelyabinsk and Miass are located on the river.

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