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

Berzhahn lies on the north slope of the broad woodland 4 km southeast of Westerburg.

Since 1972 it has belonged to what was then the newly founded Verbandsgemeinde of Westerburg, a kind of collective municipality.

From there, the cities of Cologne, Koblenz, Frankfurt am Main and Wiesbaden may be reached directly.

The nearest InterCityExpress stops are the railway stations at Montabaur and Limburg Süd on the Cologne-Frankfurt high-speed rail line.