The Lieser (German pronunciation: [ˈliːzɐ] ⓘ) is a small river in Rhineland-Palatinate, Germany, a left tributary of the Moselle.

It rises in the Eifel, near Boxberg, north of Daun.

The Lieser flows south through Daun, Manderscheid and Wittlich.

It flows into the Moselle west of the village of Lieser.

This article related to a river in Rhineland-Palatinate is a stub.