The Lentienses (German Lentienser) were a Germanic tribe in the region between the river Danube in the North, the river Iller in the East, and Lake Constance in the South, in what is now southern Germany. They were reported to be one of the most rebellious tribes at the time. There are only two mentions of the Lentienses, both by the Roman historian Ammianus Marcellinus (330–395).
First, they appeared in 355 when the Roman commander Arbetio was ordered by Emperor Constantius II to fine the Lentienses for several incursions the Roman Empire. Secondly, they were mentioned when they crossed the frozen Rhine in February 378, invading the Roman Empire. They were defeated by the Roman emperor Gratianus in the Battle of Argentovaria (modern Colmar in Alsace), when their king, Priarius, died. This battle was the last campaign by any Roman Emperor behind the Limes area. It was also the last time the name Lentienses was mentioned in historical documents.
- Dieter Geuenich (2001). Johannes Hoops, ed. Reallexikon der Germanischen Altertumskunde (in German). Berlin/New York: Walter de Gruyter. pp. 266–267.