Prangins (pʁɑ̃ʒɛ̃) is a municipality in the district of Nyon in the canton of Vaud in Switzerland. It is located on Lake Geneva.
Prangins is first mentioned around 1135-85 as Prengins. Following the fall of the Second French Empire, Prince Napoléon Bonaparte and his wife, Princess Maria Clotilde of Savoy, resided in exile at Château de Prangins, where Charles I of Austria and his family would later take residence briefly, beginning 20 May 1919.
Prangins has an area, , of . Of this area, or 54.7% is used for agricultural purposes, while or 13.1% is forested. Of the rest of the land, or 31.3% is settled (buildings or roads), or 0.7% is either rivers or lakes and or 0.2% is unproductive land.
Of the built up area, industrial buildings made up 1.5% of the total area while housing and buildings made up 18.2% and transportation infrastructure made up 7.6%. while parks, green belts and sports fields made up 3.5%. Out of the forested land, 10.9% of the total land area is heavily forested and 2.2% is covered with orchards or small clusters of trees. Of the agricultural land, 42.6% is used for growing crops and 5.1% is pastures, while 7.0% is used for orchards or vine crops. Of the water in the municipality, 0.5% is in lakes and 0.2% is in rivers and streams.
The municipality was part of the Nyon District until it was dissolved on 31 August 2006, and Prangins became part of the new district of Nyon.
The municipality is located on a terrace on the north shore of the Petit-Lac portion of Lake Geneva. It consists of the village of Prangins and the hamlets of Bénex and Promenthoux.
The blazon of the municipal coat of arms is Azure, a Tower roofed Argent, in base three Hands of the same shaking issuant from dexter, sinister and base.
Prangins has a population () of . , 26.7% of the population are resident foreign nationals. Over the last 10 years (1999–2009 ) the population has changed at a rate of 28.6%. It has changed at a rate of 19.7% due to migration and at a rate of 8.9% due to births and deaths.