Deggendorf is a town in Bavaria, Germany, capital of the Deggendorf district.
It is located on the left bank approximately in the middle between the Danube cities of Regensburg and Passau. The Danube forms the town's natural border towards the south. Towards the west, north and east the town is surrounded by the foothills of the central Bavarian Forest.
Near the southwestern rim of the town, the railway bridge crosses the Danube at river-kilometer 2286. Directly south of the town Autobahn A3 and A92 form an important crossing.
A few miles downstream, east of the district Deggenau, lies the confluence of the River Isar with the Danube.