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

The river Nister, which is part of the Sieg drainage basin, flows east to west through the municipal area.

In the 9th century, Hahn bei Marienberg had its first documentary mention.

South of the community runs Bundesstraße 255, leading from Montabaur to Herborn.

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