Nomborn 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 on the edge of the Nassau Nature Park.

The community belongs to the Verbandsgemeinde of Montabaur, a kind of collective municipality.

The community's arms show a stylized representation of Saint Kilian’s Church above.

The seven hexagons symbolize the basalt columns found in the area around the Hausberg Bornkasten.