Miass River (Russian: Миасс, IPA: [mʲɪˈas], Bashkir: Мейәс) is a river on the eastern side of the Ural Mountains. It flows through Bashkortostan, Chelyabinsk Oblast, and Kurgan Oblast.
It forms part of the Ob River system.
Chelyabinsk is located on the river.
Coordinates: 56°05′44″N 64°29′56″E / 56.0956°N 64.4989°E