Juvisy-sur-Orge is a commune in the Essonne department in Île-de-France in northern France. It is located 18 km south-east of Paris, a few kilometres south of Orly Airport. The site of the town has been occupied from ancient times; it is noted in Julius Caesar's book about the Gallic Wars. Centuries later, it became an important place under the French monarchy, as a royal hotel. It would also be used as a post relay, the first one on the road to Fontainebleau.