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

Neustadt is surrounded by the communities of Niederroßbach in the north, Emmerichenhain in the east, Hellenhahn-Schellenberg in the south and Höhn in the west.

The wavy bend sinister in the community's arms stands for its location on the Große Nister.

Right near the community run Bundesstraßen 54, linking Limburg an der Lahn with Siegen, and 255, leading from Montabaur to Herborn.

The nearest InterCityExpress stop is the railway station at Montabaur on the Cologne-Frankfurt high-speed rail line.