Herschbach (Oberwesterwald) is an Ortsgemeinde – a community belonging to a Verbandsgemeinde – in the Westerwaldkreis in Rhineland-Palatinate, Germany.

It belongs to the Verbandsgemeinde of Wallmerod, a kind of collective municipality.

Herschbach has two outlying centres named Wahnscheid and Lochheim.

Running right through the community is Bundesstraße 8, linking Limburg an der Lahn and Hennef (Sieg).

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