The Alsenz (German pronunciation: [ˈalzɛnt͡s] ⓘ) is a river in Rhineland-Palatinate, Germany, a right tributary to the Nahe.

It rises in Enkenbach-Alsenborn, north-east of Kaiserslautern, flows generally north, and joins the Nahe in Bad Münster am Stein-Ebernburg.

[1] Its length is roughly 57 kilometres (35 mi).

Towns along the Alsenz include Winnweiler, Rockenhausen and Alsenz.

This article related to a river in Rhineland-Palatinate is a stub.