Vilters-Wangs is a municipality in the Wahlkreis (constituency) of Sarganserland in the Canton of St. Gallen in Switzerland .

Vilters-Wangs is first mentioned about 843 as Filtris.

Vilters-Wangs has an area, as of 2006, of 32.7 km2 (12.6 sq mi). Of this area, 46.3% is used for agricultural purposes, while 34% is forested. Of the rest of the land, 5.1% is settled (buildings or roads) and the remainder (14.5%) is non-productive (rivers or lakes).