Syens is a municipality in the district of Broye-Vully in the canton of Vaud in Switzerland. Syens is first mentioned in 1018 as Ciens. Syens has an area, , of . Of this area, or 55.2% is used for agricultural purposes, while or 33.3% is forested. Of the rest of the land, or 11.1% is settled (buildings or roads). Of the built up area, housing and buildings made up 3.2% and transportation infrastructure made up 7.1%. Out of the forested land, all of the forested land area is covered with heavy forests. Of the agricultural land, 44.0% is used for growing crops and 10.7% is pastures. The municipality was part of the Moudon District until it was dissolved on 31 August 2006, and Syens became part of the new district of Broye-Vully. The municipality is located south of Moudon. It consists of the village of Syens and the hamlet of Bressonnaz. The blazon of the municipal coat of arms is Gyrrony of Eight, a Buch Or, in chief a Mullet of Five of the same. Syens has a population () of . , 15.7% of the population are resident foreign nationals. Over the last 10 years (1999–2009 ) the population has changed at a rate of 0.8%. It has changed at a rate of -2.3% due to migration and at a rate of 5.5% due to births and deaths. Most of the population () speaks French (101 or 86.3%), with German being second most common (10 or 8.5%) and English being third (2 or 1.7%). Of the population in the municipality 30 or about 25.6% were born in Syens and lived there in 2000. There were 40 or 34.2% who were born in the same canton, while 24 or 20.5% were born somewhere else in Switzerland, and 23 or 19.7% were born outside of Switzerland. In there were 2 live births to Swiss citizens and 1 death of a Swiss citizen. Ignoring immigration and emigration, the population of Swiss citizens increased by 1 while the foreign population remained the same. At the same time, there was 1 non-Swiss man who emigrated from Switzerland to another country. The total Swiss population change in 2008 (from all sources, including moves across municipal borders) was a decrease of 1 and the non-Swiss population increased by 1 people.