Sargans is a municipality in the Wahlkreis (constituency) of Sarganserland in the canton of St Gallen in Switzerland.

Sargans is known for its castle, which dates from before the founding of the Swiss Confederation in 1291. Sargans was also a County of the Holy Roman Empire.

Both the local mining operation and Schloss Sargans are listed as Swiss heritage sites of national significance.

Sargans is an important regional transportation node. Trains heading north toward St Gallen, east toward Chur and Ticino, and toward Austria, all pass through Sargans. Buses heading toward Liechtenstein also leave Sargans.

Sargans Castle was the seat of the counts of Werdenberg-Sargans in the 13th century. Since 1899, it has been run by the local church and now houses the Sarganserland museum.