Mokřiny (German: Nassengrub) is a village in Karlovy Vary Region, Czech Republic, and the second most populous town district of Aš.

Mokřiny is located to the south from Aš; unlike other town districts, it forms a continuous populated area with it.

To the east it neighbours with Vernéřov, to the south with Nový Žďár, and to the southeast with Nebesa.

Mokřiny was established by the Zedtwitz, before 1413, when it is first mentioned.

In 1874 Mokřiny became a separate municipality.