Tannay is a municipality in the district of Nyon in the canton of Vaud in Switzerland. Tannay may have been founded before the town of Coppet, which was first mentioned in 1294. However, it is first mentioned in 1390 as Taney. During the Middle Ages, it was part of the barony of Coppet. In 1536 the region became part of the Canton of Bern and the village was part of the Vogtei of Nyon, with the Baron of Coppet retaining power over the villages surrounding Coppet. Tannay Castle was built in 1649. In the 17th century, French Huguenots from the Pays de Gex region fled to Tannay to escape persecution. The descendants of one of these refugees, Jean Delor, founded a successful watch factory in the 19th century. In 1858 a rail station on the Geneva-Lausanne line opened in Tannay. However, until about 1950, it was primarily a rural, farming village. By the beginning of the 21st century it had transformed into a bedroom community of Geneva. Tannay has an area, (as of the 2004/09 survey) of . Of this area, about 47.0% is used for agricultural purposes, while 13.8% is forested. Of the rest of the land, 39.2% is settled (buildings or roads). In the 2013/18 survey a total of or about 31.5% of the total area was covered with buildings, an increase of over the 1980 amount. Recreational space makes up about 0.56% of the total area. Of the agricultural land, is used for orchards and vineyards and is fields and grasslands. Since 1980 the amount of agricultural land has decreased by . Over the same time period the amount of forested land has decreased by . Rivers and lakes cover in the municipality. The municipality was part of the old Nyon District until it was dissolved on 31 August 2006, and Tannay became part of the new district of Nyon. The municipality is located on a terrace overlooking Lake Geneva, between Geneva-Saint-Cergue and Geneva-Lausanne roads. The blazon of the municipal coat of arms is Per fess: 1. Azure, three Bars wavy Argent; 2. Argent, an Oak Tree Vert fructed Or issuant from a Coupeaux Sable.
Roberto Castello, Gilles Desthieux