Denens is a municipality in the Swiss canton of Vaud, located in the district of Morges.
Denens is first mentioned in 1005 as Disnens.
Denens has an area, , of . Of this area, or 85.1% is used for agricultural purposes, while or 3.0% is forested. Of the rest of the land, or 11.6% is settled (buildings or roads) and or 0.3% is unproductive land.
Of the built up area, housing and buildings made up 7.6% and transportation infrastructure made up 3.0%. Out of the forested land, 1.5% of the total land area is heavily forested and 1.5% is covered with orchards or small clusters of trees. Of the agricultural land, 66.9% is used for growing crops and 2.4% is pastures, while 15.8% is used for orchards or vine crops.
The municipality was part of the Morges District until it was dissolved on 31 August 2006, and Denens became part of the new district of Morges.
The municipality is located on a plateau above the Morges river.
The blazon of the municipal coat of arms is Argent, on a Coupeaux Vert a Crow statant Sable beaked Or.
Denens has a population () of . , 14.1% of the population are resident foreign nationals. Over the last 10 years (1999–2009 ) the population has changed at a rate of 13.4%. It has changed at a rate of 6.1% due to migration and at a rate of 7.5% due to births and deaths.
Most of the population () speaks French (515 or 88.6%), with German being second most common (31 or 5.3%) and English being third (9 or 1.5%). There are 3 people who speak Italian.
Of the population in the municipality 135 or about 23.2% were born in Denens and lived there in 2000. There were 222 or 38.2% who were born in the same canton, while 118 or 20.3% were born somewhere else in Switzerland, and 100 or 17.2% were born outside of Switzerland.
In there were 3 live births to Swiss citizens and 1 birth to non-Swiss citizens, and in same time span there was 1 death of a Swiss citizen. Ignoring immigration and emigration, the population of Swiss citizens increased by 2 while the foreign population increased by 1.