The Juthungi (Greek: Iouthungoi, Latin: Iuthungi) were a Germanic tribe in the region north of the rivers Danube and Altmühl in what is now the modern German state of Bavaria.

Memorial stone from Augsburg

The tribe was mentioned by the Roman historians Publius Herennius Dexippus and Ammianus Marcellinus. The meaning of their name is “descendants”, and refers to the ancient Suebian tribe of the Semnoni.[citation needed]

The Juthungi invaded Italy in 259260, but on their way back they were defeated near Augsburg on 2425 April 260 by Marcus Simplicinius Genialis (this is recorded on a Roman victory altar found in 1992). At this time the Roman Empire lost control of this part of the limes.

The Juthungi invaded Italy again in 271, defeating the Romans at the Battle of Placentia, but they were repulsed by Aurelian after the Battle of Fano and Battle of Pavia.

Between 356 and 358 the Juthungi and the Alamanni invaded the province of Raetia, and destroyed Castra Regina (Regensburg), which was the Roman capital of the province, and one of the biggest Roman military camps in south Germany, with massive stone walls and a village.

A second invasion of Raetia in 383 was repelled by an army of Alans and Huns. Between 429 and 431 the Roman general Aëtius also fought against the Juthungi in Raetia.

The Juthungi's eventual fate is unknown by modern historians but it is known that they cooperated with other German tribes against Rome in various wars. Due to the eventual rise of tribes such as the Franks, it is likely that the Juthungi were either absorbed by such tribes or were annihilated.