Klaus 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 and forms part of the Alpine Rhine valley area.
Administratively it belongs to the Feldkirch district, one of the districts that make up Vorarlberg, Austria's westernmost state. As a municipality, Klaus is a local administrative unit with its own local government, and it is one of several small communities in the surrounding area of the district.