Jonschwil is a municipality in the Wahlkreis (constituency) of Wil in the canton of St. Gallen in Switzerland.

Of the rest of the land, 15% is settled (buildings or roads) and the remainder (1.9%) is non-productive (rivers or lakes).

It consists of the villages of Jonschwil and Schwarzenbach and the hamlets of Bettenau and Oberrindal as well as scattered farm houses.

Bettenauer Weiher is a small lake located in Oberuzwil at the border to Jonschwil.

The blazon of the municipal coat of arms is Or St. Martin armoured Azure holding a sword Argent cutting his cloak Gules riding on a Horse Sable.

Of the foreign population, (as of 2000[update]), 31 are from Germany, 31 are from Italy, 150 are from ex-Yugoslavia, 21 are from Austria, 15 are from Turkey, and 27 are from another country.

[8] The age distribution, as of 2000[update], in Jonschwil is; 462 children or 14.7% of the population are between 0 and 9 years old and 536 teenagers or 17.1% are between 10 and 19.

For the first time in 1996, an openair concert was held at the foot of the Wildberg through the anniversary festival "1200 Years of Jonschwil".

In 2006, the OpenAir Tufertschwil took place here with groups such as Status Quo, Jamiroquai, Tokio Hotel and DJ Bobo.

The following bands played: Gary Moore, Jethro Tull, The Hooters, Florian Ast, Bootleg Beatles on Friday and Nena, Polo Hofer & die Schmetterband, Sunrise Avenue, Plüsch, Bagatello, Starch, Frantic and the Tiger Ensemble from St. Pauli on Saturday.

In August 2008, the US band Metallica played the only concert of the Summer Vacation Tour on Swiss soil here in front of more than 35,000 spectators.

A curious consequence of this concert was that Nothing else matters from 1992 again rose to number 10 in the Swiss singles charts.

With Metallica, Megadeth, Slayer and Anthrax, four bands that have shaped the style of thrash metal were on stage.