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

The community lies in the Westerwald south of Montabaur in the Nassau Nature Park.

Horbach's location in the so-called Buchfinkenländchen is symbolized by the common chaffinch in the community's arms.

The wavy bend stands for one of the headwater streams that builds the Daubach, which rises in Horbach.

The tinctures red and silver were the heraldic colours borne by the Electorate of Trier.