Wattwil is a municipality in the Wahlkreis (constituency) of Toggenburg in the canton of St. Gallen in Switzerland, located along the Thur river.

Of the rest of the land, 8.3% is settled (buildings or roads) and the remainder (1.8%) is non-productive (rivers or lakes).

Of the rest of the land, 2.8% is settled (buildings or roads) and the remainder (0.6%) is non-productive (rivers or lakes).

[5] It consisted of the village of Krinau and the hamlets of Altschwil, Au, Dreischlatt, Gurtberg, Schuflenberg, Krinäuli, Niederberg, Kapf and Gruben.

The municipal coat of arms is blazoned Or, two Unicorns' Heads couped addorsed Azure.

It was introduced in 1924 (the design of the unicorns used based on a drawing by Fritz Brunner), and ratified 13 October 1925.

The design is based on the coat of arms of the Iberg bailiwick of the Abbey of St. Gallen, first attested in a Wappenscheibe dated 1551 (again in 1581, 1629 and 1708).

Of the foreign population, (as of 2000[update]), 192 are from Germany, 335 are from Italy, 717 are from ex-Yugoslavia, 29 are from Austria, 388 are from Turkey, and 322 are from another country.

[10] The villages of Wattwil and Lichtensteig are designated as part of the Inventory of Swiss Heritage Sites.

[11] There are several notable buildings in the municipality, including a church, a former abbey, and Burg Iberg.

The station is served by regional trains of St. Gallen S-Bahn and the InterRegio Voralpen-Express.

PostBus Switzerland operates a bus line to the upper part of the valley.