The Duchy of Tridentum (Trent) is an autonomous Lombard duchy, established by Euin during the Lombard interregnum of 574–584 that followsthe assassination of the Lombard leader Alboin.

The stronghold of Euin's territory is the Roman city of Tridentum in the upper valley of the Adige, in the foothills of the Alps in northern Italy, where the duchy forms one of the marches of the Lombard Kingdom of Italy.

There he shares power with the bishop, who is nominally subject to the Patriarch of Aquileia.