Denezy is a former municipality in the district of Gros-de-Vaud in the canton of Vaud in Switzerland. The municipalities of Chapelle-sur-Moudon, Correvon, Denezy, Martherenges, Neyruz-sur-Moudon, Peyres-Possens, Saint-Cierges, Thierrens and Chanéaz merged on 1 January 2013 into the new municipality of Montanaire. Denezy is first mentioned in 929 as villare Donaciaco. In 1142 it was mentioned as Danisei. Denezy had an area, , of . Of this area, or 72.0% is used for agricultural purposes, while or 23.2% is forested. Of the rest of the land, or 5.3% is settled (buildings or roads). Of the built up area, housing and buildings made up 2.9% and transportation infrastructure made up 2.4%. Out of the forested land, 20.6% of the total land area is heavily forested and 2.6% is covered with orchards or small clusters of trees. Of the agricultural land, 49.3% is used for growing crops and 22.2% is pastures. The former municipality was part of the Moudon District until it was dissolved on 31 August 2006, and Denezy became part of the new district of Gros-de-Vaud. The former municipality is located on the road between Lausanne and Estavayer. The blazon of the municipal coat of arms is Azure, a Saltire Argent, a Buck statant Gules overall. Denezy had a population () of 141. , 6.4% of the population are resident foreign nationals. Over the last 10 years (1999–2009 ) the population has changed at a rate of 10%. It has changed at a rate of 16.2% due to migration and at a rate of -6.2% due to births and deaths. Most of the population () speaks French (112 or 91.8%), with German being second most common (7 or 5.7%) and Italian being third (1 or 0.8%). Of the population in the municipality 48 or about 39.3% were born in Denezy and lived there in 2000. There were 43 or 35.2% who were born in the same canton, while 18 or 14.8% were born somewhere else in Switzerland, and 9 or 7.4% were born outside of Switzerland. In there were no live births to Swiss citizens and there were 2 deaths of Swiss citizens.