The canton of St. Gallen or St Gall ( ; ; ; ) is a canton of Switzerland. Its capital is St. Gallen.

Located in northeastern Switzerland, the canton has an area of 2026 km2 (5% of Switzerland) and a resident population close to half a million as of 2015 (6% of Switzerland). It was formed in 1803 as a conflation of the city of St. Gallen,