Ermsdorf (Luxembourgish: Iermsdref) is a village and former commune in eastern Luxembourg.

As of 2024[update], the village of Ermsdorf, which lies in the south of the commune, has a population of 466.

[1] In 2011, Ermsdorf merged with Medernach to become the commune of Vallée de l'Ernz.

The former commune consisted of the villages:

This article related to the geography of Diekirch canton is a stub.