Hahnenbach is an Ortsgemeinde – a municipality belonging to a Verbandsgemeinde, a kind of collective municipality – in the Bad Kreuznach district in Rhineland-Palatinate, Germany. It belongs to the Verbandsgemeinde Kirner Land, whose seat is in the town of Kirn. Hahnenbach is a state-recognized tourism community.
Hahnenbach lies on the like-named brook, the Hahnenbach, which empties into the Nahe near Kirn. Hahnenbach lies northwest of Kirn right at the boundary with the neighbouring Birkenfeld district.
Clockwise from the north, Hahnenbach's neighbours are the municipalities of Hennweiler and Oberhausen bei Kirn and the town of Kirn, all of which likewise lie within the Bad Kreuznach district, while the municipalities of Bergen, Griebelschied and Sonnschied all lie in the neighbouring Birkenfeld district. Hahnenbach also comes to within a few metres of the municipality of Bruschied (Bad Kreuznach district), but does not touch it.
Like the neighbouring village of Hennweiler (formerly known as Hanenwilare), the name Hahnenbach (formerly known as Hanenbach) may go back to a common forename that cropped up in a Frankish noble clan, the Haganons. They were, beginning in the 7th century, enfeoffed and resident as members of a so-called Imperial nobility in the Rhenish Hesse area. This clan's descendants are believed to have made land arable and founded settlements in the 7th and 8th centuries when the woodlands between the Moselle and the Nahe were opened up. Many placenames therefore go back to a village's owner, founder or head from whom the original homestead, or later the village, drew its name. In the High and Late Middle Ages, Hahnenbach was held by the Lords of Stein (Steinkallenfels), that is to say, the villagers were liable to the lords of that castle for service and taxes. After Castle Wartenstein had been built by Sir Tilmann vom Stein (1357), Hahnenbach became part of the Lordship, and later Amt of Wartenstein, which was made up of the Unterämter of Hennweiler and Hahnenbach or Weiden.