Wildhaus is a municipality in the Wahlkreis (constituency) of Toggenburg in the canton of St. Gallen in Switzerland. The village is located on Wildhaus Pass (1090 m.) from Gams, in the Rhine valley, to Unterwasser in Toggenburg between the Churfirsten peaks and Säntis. The municipality has an area of 34.43 km² and a population of 1258 as of 31. December 2003. The ski slopes above Wildhaus, Unterwasser and Alt St. Johann on the Churfirsten ranges reach 2262 m. The reformer Huldrych Zwingli was born in Wildhaus in 1484. His birth house can still be visited.