Oberhausen bei Kirn 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. Oberhausen bei Kirn is one of two municipalities in the district with the name Oberhausen. The other is Oberhausen an der Nahe.
Oberhausen bei Kirn lies on a high plateau at the edge of the Lützelsoon above Kirn on the River Nahe.
Clockwise from the north, Oberhausen bei Kirn's neighbours are the municipalities of Hennweiler, Heinzenberg and Hochstetten-Dhaun, the town of Kirn and the municipality of Hahnenbach, all of which likewise lie within the Bad Kreuznach district.
Also belonging to Oberhausen bei Kirn are the outlying homesteads of Itzebacherhof, Königshof and Schloss Wartenstein.
The land that is now Oberhausen's municipal area was settled very early on. A few archaeological finds at barrows of the so-called "Old Hunsrück-Eifel Culture", for instance a bronze torc and bronze armrings, are traces of human habitation from the time between 600 and 400 BC. Leading across what is now the municipal area were two important prehistoric roads, of which the so-called Salzstraße ("Salt Road") linked the upper Nahe region with the Rhine and the other, a road from Kirchberg to Meisenheim, served as a north–south link between the Moselle region and the North Palatine Uplands. Oberhausen's first documentary mentions are found in documents from 1342 (Obernhusen) and 1346. The latter is a Weistum (cognate with English wisdom, this was a legal pronouncement issued by men learned in law in the Middle Ages and early modern times) in which the court Schöffe (roughly "lay jurist") "Hermann von Obirnhusen" is named as a member of the Hennweiler court's council of Schöffen. Oberhausen then belonged to the Vogtei of Heinzenberg, a mediaeval jurisdictional and administrative region formed of the villages of Hennweiler, Oberhausen, Guntzelnberg, Rode and Heinzenberg and the Eigener Hof (an estate).