St. Gallen ( ; Saint-Gall; San Gallo) is the capital of the canton of St. Gallen in Switzerland. It evolved from the hermitage of Saint Gall, founded in the 7th century. Today, it is a large urban agglomeration (with around 160,000 inhabitants) and represents the center of eastern Switzerland. The town mainly relies on services for its economic base.

The city has good transport links to the rest of the country and to neighbouring Germany and Austria. It also functions as the gate to the Appenzell mountain area.

The main tourist attraction is the Abbey of St. Gall, a UNESCO World Heritage Site. Its renowned library contains books which date to the 9th century.