Sankt Gallenkirch is a municipality in the district of Bludenz, in the Austrian state of Vorarlberg. It lies in the westernmost part of Austria, in a mountainous Alpine setting within the Bludenz district, which covers the southern and western portions of Vorarlberg.
As a municipality, Sankt Gallenkirch is one of the administrative units that make up the Bludenz district, alongside the district's other towns and villages. The surrounding region is characterised by Alpine terrain typical of Vorarlberg, Austria's westernmost federal state.