Dornbirn is a city in the Austrian state of Vorarlberg. It is the administrative centre for the district of Dornbirn, which also includes the town of Hohenems, and the market town Lustenau.
Dornbirn is located in western Vorarlberg at 437 metres above sea level in the Rhine Valley, at the foot of the Karren mountain, part of the Bregenz Forest Mountain chain at the edge of the Eastern Alps. It is near the borders to Switzerland, Germany and Liechtenstein.
The Dornbirner Ach river flows through the town and later into Lake Constance.
