The noble family von Sax were a medieval noble family in eastern Switzerland. They owned estates and castles on both sides of the Alps in the modern cantons of St. Gallen, Graubünden and Ticino. The origin of the family is unknown, but they probably stem from Churrätien nobility and were related to the da Torre family. The family divided into two main lines; the Grafen (counts) von Sax-Misox and the Freiherren (barons) von Hohensax.

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