Pleizenhausen is an Ortsgemeinde – a municipality belonging to a Verbandsgemeinde, a kind of collective municipality – in the Rhein-Hunsrück-Kreis (district) in Rhineland-Palatinate, Germany. It belongs to the Verbandsgemeinde of Simmern, whose seat is in the like-named town.
The municipality lies in the Hunsrück, roughly 5 km northeast of Simmern. The residential village also lies just west of the junction of two valleys, the Simmerbachtal and the Wahlbachtal, and about a kilometre east of the Simmern-Koblenz road. At the nearby Weißmühle (“White Mill”), three brooks, the Simmerbach, Benzweilerbach and Wahlbach, all meet and flow together. The Geiersberg to the northeast stands as a prominent peak between the Simmerbach and Benzweilerbach valleys and stands out quite clearly on a relief map.