This article is about the city in Switzerland, for other meanings see St. Gallen (disambiguation).

The city of St. Gallen (Swiss German Sanggale, French Saint-Gall, Italian San Gallo, Rhaeto-RomanicAudio-Datei / Hörbeispiel Sogn Gagl? /i) is a political municipality and the eponymous capital of the eastern Swiss canton of St. Gallen. St. Gallen has a population of around 80,000 and is one of the highest cities in Switzerland at an altitude of around 700 metres above sea level. St. Gallen lies on the Steinach, a river that flows into Lake Constance, and has also been divided by the Sittertobel since the city was expanded in 1918. The origins of the city of St. Gallen date back to the 7th century. It originated as a settlement around the monastery of St. Gallen, founded around 720 on the site of a hermitage, and grew into a town in the 10th century; it became an imperial city in 1180.

Today, St. Gallen functions as the cultural and economic centre of Eastern Switzerland; the city is considered the metropolis of Eastern Switzerland. It lies on the main transport axes (Munich-)St. Margrethen-Rorschach-St. Gallen-Winterthur-Zurich and (Konstanz-)Romanshorn-St. Gallen-Rapperswil-Lucerne and is considered the gateway to Appenzellerland. The city is interesting for tourists because of the Abbey Church and the Abbey Library, which have been included in the UNESCO World Heritage List. St. Gallen is also known for its embroidery. These can be seen today in the St. Gallen Textile Museum, which is dedicated to the history of the textile industry in eastern Switzerland. In addition to the highest cantonal authorities, the University of St. Gallen and the Federal Administrative Court (FAC) are also based in the city.

St. Gallen got its name from the wandering monk Gallus, which is why it is also called the city of Gallus.