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

The residential community of Roßbach belongs to the Verbandsgemeinde of Hachenburg, a kind of collective municipality.

The municipal council is made up of 13 council members, including the extraofficial mayor (Bürgermeister), who were elected in a municipal election on 13 June 2004.

Roßbach lies west of Bundesstraße 413 from Bendorf (near Koblenz) to Hachenburg.

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