Rankweil is a town in the westernmost Austrian state of Vorarlberg, in the district Feldkirch. It is the second largest town in the district Feldkirch and the eighth largest town in Vorarlberg.

Rankweil is located in the southern Rhine Valley. Its largest river is the Frutz, from which the Mühlbach was channeled off through the town for utilization by ten hydroelectric plants.

The two precincts of Rankweil are Brederis and Rankweil. The town adjoins Koblach, Röthis, Sulz, Zwischenwasser, Laterns, Übersaxen, Satteins, Göfis, Feldkirch and Meiningen.

At the time of the Roman Empire, today's Rankweil was known as "Vinomna". Vinomna was a transport hub where stone-paved Roman roads converged, including the main road from Chur to Augsburg. Rankweil itself was first mentioned in 842.

In 1375 the Counts of Montfort sold the dominion of Feldkirch, including Rankweil, to the Habsburgs. In 1618 Rankweil was granted market rights. Since its founding in 1918, Rankweil has belonged to the Austrian state of Vorarlberg.

Rankweil's current mayor is Katharina Wöß-Krall, of the People's Party Rankweil. She has been in office since 2019. The local council of Rankweil consists of 33 members.

Rankweil has been awarded a “family plus”-community – an award from the state of Vorarlberg for family-friendly communities.

Rankweil is a place of pilgrimage, known for its Basilica. Other sites include: