Romanel-sur-Morges is a municipality in the canton of Vaud in Switzerland, located in the district of Morges.
Romanel-sur-Morges is first mentioned in 967 as villa Romanella.
Romanel-sur-Morges has an area, , of . Of this area, or 64.6% is used for agricultural purposes, while or 16.0% is forested. Of the rest of the land, or 16.0% is settled (buildings or roads).
Of the built up area, industrial buildings made up 4.0% of the total area while housing and buildings made up 7.4% and transportation infrastructure made up 2.9%. while parks, green belts and sports fields made up 1.1%. Out of the forested land, 14.3% of the total land area is heavily forested and 1.7% is covered with orchards or small clusters of trees. Of the agricultural land, 55.4% is used for growing crops and 3.4% is pastures, while 5.7% is used for orchards or vine crops.
The municipality was part of the Morges District until it was dissolved on 31 August 2006, and Romanel-sur-Morges became part of the new district of Morges.
The municipality is located between Morges and Cossonay on the right bank of the Venoge river.
The blazon of the municipal coat of arms is Argent, a Chief Gules, overall on a Bend Sable in chief a Corn-ear bendwise Or.
Romanel-sur-Morges has a population () of . , 9.0% of the population are resident foreign nationals. Over the last 10 years (1999–2009 ) the population has changed at a rate of 13.5%. It has changed at a rate of 6% due to migration and at a rate of 7.5% due to births and deaths.
Most of the population () speaks French (412 or 93.4%), with German being second most common (13 or 2.9%) and Italian being third (5 or 1.1%).
Of the population in the municipality 96 or about 21.8% were born in Romanel-sur-Morges and lived there in 2000. There were 222 or 50.3% who were born in the same canton, while 72 or 16.3% were born somewhere else in Switzerland, and 46 or 10.4% were born outside of Switzerland.
In there were 2 live births to Swiss citizens and 1 birth to non-Swiss citizens, and in same time span there were 2 deaths of Swiss citizens.