Tannay (French pronunciation: [tanɛ] ⓘ) is a municipality in the district of Nyon in the canton of Vaud in Switzerland.

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.

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.

Over the same time period the amount of forested land has decreased by 1 ha (2.5 acres).

[8] The municipality is located on a terrace overlooking Lake Geneva, between Geneva-Saint-Cergue and Geneva-Lausanne roads.

Argent, an Oak Tree Vert fructed Or issuant from a Coupeaux Sable.

[16] Most of the population (as of 2000[update]) speaks French (867 or 70.7%), with German being second most common (123 or 10.0%) and English being third (112 or 9.1%).

[17] The historical population is given in the following chart:[4][18] In the 2015 federal election the most popular party was the FDP with 38.7% of the vote.

In the federal election, a total of 390 votes were cast, and the voter turnout was 50.2%.

In the federal election, a total of 377 votes were cast, and the voter turnout was 53.0%.

Of these, a total of 9 people worked in 9 businesses in the primary economic sector.

[23] In 2015 the average cantonal, municipal and church tax rate in the municipality for a couple with two children making SFr 80,000 was 4.5% while the rate for a single person making SFr 150,000 was 17.4%.

In the tertiary sector; 19 or 25.0% were in wholesale or retail sales or the repair of motor vehicles, 22 or 28.9% were in a hotel or restaurant, 2 or 2.6% were in the information industry, 2 or 2.6% were the insurance or financial industry, 14 or 18.4% were technical professionals or scientists, 4 or 5.3% were in education and 3 or 3.9% were in health care.

[16] From the 2000 census[update], 382 or 31.1% were Roman Catholic, while 367 or 29.9% belonged to the Swiss Reformed Church.

In the Vaud cantonal school system, two years of non-obligatory pre-school are provided by the political districts.

The canton's primary school program requires students to attend for four years.