Dornbirn is a city in Vorarlberg, Austria. It is the administrative center of the district (Bezirk) Dornbirn, which also includes the city of Hohenems, and the market town Lustenau.
The largest and busiest city in Vorarlberg and the tenth largest in all of Austria, Dornbirn is an important commercial center and shopping mecca.
Dornbirn is located in western Vorarlberg at 437 meters above sea level in the Rhine Valley at the foot of the Karren mountain, part of the Bregenzerwaldgebirge 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 city and later into Lake Constance.