Nannhausen is a municipality located in the Rhein-Hunsrück-Kreis district of Rhineland-Palatinate, Germany. It is classified as an Ortsgemeinde, which is a type of local municipality belonging to a collective municipality.
The village is part of the Verbandsgemeinde Simmern-Rheinböllen. The administrative seat for this collective municipality is situated in the town of Simmern.