| Alsenz | |
| Mouth Location: | Nahe |
| Mouth Coordinates: | 49.8075°N 7.8425°W |
| Subdivision Type1: | Country |
| Subdivision Type2: | State |
| Subdivision Name2: | Rhineland-Palatinate |
| Length Km: | 57 |
The Alsenz (pronounced as /de/) 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 . Towns along the Alsenz include Winnweiler, Rockenhausen and Alsenz.