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

The community lies in the Westerwald between Montabaur and Limburg an der Lahn.

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

Running right through the community is Kreisstraße 160, which joins Bundesstraße 8 in Malmeneich.

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