Sulz is a municipality in the district of Feldkirch, in the Austrian state of Vorarlberg. It lies in the far west of Austria, in a region that borders Switzerland and Liechtenstein.
The municipality is one of several small communities that make up the Feldkirch district, the westernmost district of Vorarlberg. The district's administrative centre, the town of Feldkirch, is a short distance away and serves as the area's main urban and transport hub.
Sulz is a rural community typical of the Vorarlberg Rhine valley area, a landscape shaped by Alpine terrain and nearby river valleys. As with other municipalities in the district, it is administered as an independent local authority within the Austrian system of local government.