Medernach (Luxembourgish: Miedernach) is a town and former commune in eastern Luxembourg.

In 2011, Medernach merged with Ermsdorf to form the commune of Vallée de l'Ernz.

The parish church, built in a neo-Romanesque style in 1806, has been a national monument since 2004.

It houses the Baroque altar from the (now defunct) church of the Franciscan friars of Diekirch, dated 1712,[1] as well as a series of the Stations of the Cross.Every year, the local produce exhibition is the first weekend of September.

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