Waldmühlen is an Ortsgemeinde – a community belonging to a Verbandsgemeinde – in the Westerwaldkreis in Rhineland-Palatinate, Germany.

The community lies in the Westerwald between Siegen und Limburg. Waldmühlen belongs to the Verbandsgemeinde of Rennerod, a kind of collective municipality. Its seat is in the like-named town. The Holzbach crosses Bundesstraße 54 at the community's edge.

In the 15th century, Waldmühlen had its first documentary mention as Walkmohle.

The municipal council is made up of 8 council members who were elected in a majority vote in a municipal election on 26 March 2006.

Running right through the community is Bundesstraße 54, linking Limburg an der Lahn with Siegen. The nearest Autobahn interchanges are Herborn and Haiger-Burbach on the A 45 (Dortmund–Gießen), and also Montabaur and Limburg-Nord on the A 3 (Cologne–Frankfurt), all between 20 and 25 km away. The nearest InterCityExpress stops are the railway stations at Montabaur and Limburg-Süd on the Cologne-Frankfurt high-speed rail line.