Aclens is a municipality in the Swiss canton of Vaud, located in the district of Morges.
Aclens is first mentioned in 1002 as Astlegus.
Aclens has an area, , of . Of this area, or 68.7% is used for agricultural purposes, while or 13.6% is forested. Of the rest of the land, or 16.9% is settled (buildings or roads), or 0.3% is either rivers or lakes and or 0.5% is unproductive land.
Of the built up area, industrial buildings made up 4.6% of the total area while housing and buildings made up 3.3% and transportation infrastructure made up 4.6%. Power and water infrastructure as well as other special developed areas made up 4.4% of the area Out of the forested land, all of the forested land area is covered with heavy forests. Of the agricultural land, 61.0% is used for growing crops and 4.1% is pastures, while 3.6% is used for orchards or vine crops. All the water in the municipality is flowing water.
The municipality was part of the old Morges District until it was dissolved on 31 August 2006, and Aclens became part of the new district of Morges.
The municipality is located on a high valley above the right bank of the Venoge river.
The blazon of the municipal coat of arms is Gules, a Fountain Gules and Argent fimbriated Argent, Chief of the same.
Aclens has a population () of . , 21.1% of the population are resident foreign nationals. Over the last 10 years (1999–2009 ) the population has changed at a rate of 27.5%. It has changed at a rate of 16.9% due to migration and at a rate of 10.3% due to births and deaths.
Most of the population () speaks French (323 or 89.0%), with German being second most common (22 or 6.1%) and Italian being third (6 or 1.7%).
Of the population in the municipality 99 or about 27.3% were born in Aclens and lived there in 2000. There were 134 or 36.9% who were born in the same canton, while 65 or 17.9% were born somewhere else in Switzerland, and 56 or 15.4% were born outside of Switzerland.
In there were 8 live births to Swiss citizens and 4 births to non-Swiss citizens, and in same time span there was 1 death of a Swiss citizen and 1 non-Swiss citizen death.