Langenbach is a village (Ortsteil) of the municipality of Weilmünster in the district of Limburg-Weilburg in central Hesse, Germany.

Langenbach is located in the district of Limburg-Weilburg in central Hesse, in the eastern Hintertaunus - in a side valley of the Weiltal.

To the south, Langenbach borders the villages of Winden and Heinzenberg in the municipalities of Weilrod and Grävenwiesbach (both Hochtaunuskreis).

Langenbach consists of the old, historic town centre with the surrounding newer built-up areas Celtic fortifications on the Riesenkopf, the "Riesenburg" castle near Rohnstadt and Celtic traces on the Hünerküppel (now Hühnerküppel) indicate a very early settlement in the area around Langenbach.

The Ubians were resettled on the left bank of the Rhine by the Romans around 38 BC and later founded the cities of Bonn, Cologne and Neuss.

[1] In the course of the territorial reform in Hesse, on 31 December 1970 the former market town of Weilmünster in the Oberlahn district merged voluntarily with the previously independent municipalities of Aulenhausen, Dietenhausen, Ernsthausen, Laimbach, Langenbach, Laubuseschbach, Lützendorf, Möttau, Rohnstadt and Wolfenhausen to form the new enlarged municipality of Weilmünster.

Langenbach has a village community centre in Schulstraße, a sports pitch, a children's playground and hiking trails.