Lustenau ([ˈluːstənaʊ]; Alemannic German: Luschnou) is a town in the westernmost Austrian state of Vorarlberg in the district of Dornbirn. It lies on the river Rhine, which forms the border with Switzerland. Lustenau is Vorarlberg's fourth largest town.

Lustenau is located on the eastern bank of the Alpine Rhine, in the lower Vorarlberg Rhine Valley, which serves as the border with the Canton of St. Gallen, Switzerland. Its altitude is 404 meters above sea level.