Sankt Goarshausen is a town located in the Rhein-Lahn-Kreis in Nassau on the eastern shore of the Rhine, in the section known as the Rhine Gorge, directly across the river from Sankt Goar, in the German state Rhineland-Palatinate. It is located within the Nassau Nature Park and the Rhine Gorge UNESCO world heritage site, and was historically part of the Duchy of Nassau. It lies approximately 30 km south of Koblenz, and it is above all famous for the Lorelei rock nearby. Sankt Goarshausen is the seat of the Loreley collective municipality. The town's economy is based on wine making and tourism.
The Sankt Goarshausen railway station connects the town with Wiesbaden, Frankfurt and Koblenz. Sankt Goarshausen was formerly the terminus of the Nassau Light Railway line between Sankt Goarshausen and Nastätten.