Vorarlberg ( FOR-arl-burg; Austrian German: [foːɐ̯ˈarlbɛrɡ] ; Vorarlbergisch: Vorarlbearg, Voralbärg, or Voraadelbearg) is the westernmost state (Land) of Austria. It has the second-smallest geographical area after Vienna and, although it also has the second-smallest population, it is the state with the second-highest population density (also after Vienna). It borders three countries: Germany (Bavaria and Baden-Württemberg via Lake Constance), Switzerland (Grisons and St. Gallen), and Liechtenstein. The only Austrian state that shares a border with Vorarlberg is Tyrol, to the east.

The capital of Vorarlberg is Bregenz (29,698 inhabitants), although Dornbirn (49,845 inhabitants) and Feldkirch (34,192 inhabitants) have larger populations.