Lochau is a municipality in the Austrian state of Vorarlberg. It is located on Lake Constance, in the Bregenz district near the border to Germany.
About 50.3% of the municipality's area is forest. The Pfänder mountain is part of the municipality, also being the main mountain above Bregenz. In the west, the Leiblach river forms the border to the German rural district (Landkreis) of Lindau.