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

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

Dreisbach belongs to the Verbandsgemeinde of Bad Marienberg, a kind of collective municipality.

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

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