| Mérantaise | |
| Pushpin Map: | France#France Île-de-France |
| Source1 Coordinates: | 48.7606°N 2.0122°W |
| Mouth Coordinates: | 48.6986°N 2.1325°W |
| Subdivision Type1: | Country |
| Length: | 14.3km (08.9miles) |
The Mérantaise is a small river in southern Île-de-France (France), left tributary of the Yvette, which is a tributary of the Orge. It is 14.3km (08.9miles) long. Its source is in Voisins-le-Bretonneux, near Versailles, in the Yvelines department.
The Yvette crosses the following départements and towns: