| Rouillon | |
| Pushpin Map: | France#France Île-de-France |
| Source1 Coordinates: | 48.6797°N 2.2117°W |
| Mouth Coordinates: | 48.685°N 2.3197°W |
| Subdivision Type1: | Country |
| Length: | 9.5km (05.9miles) |
The Rouillon is a small river in southern Île-de-France (France), left tributary of the Yvette, which is a tributary of the Orge. Its source is in Villejust, north of Longjumeau, in the Essonne department. It is 9.5km (05.9miles) long.
The Rouillon crosses the following départements and towns:
Villejust, Saulx-les-Chartreux, Ballainvilliers, Longjumeau.
A bridge, call le pont des Templiers (templars bridge), considering as the older bridge in Essonne department, is nearby Balizy, an area of Longjumeau. It was built in the 13th century.