The Yvette (French pronunciation: [ivɛt]) is a small river in southern Île-de-France (France), left tributary of the Orge, which is a tributary of the Seine. It is 39.3 km (24.4 mi) long. Its source is in Les Essarts-le-Roi, north of Rambouillet, in the Yvelines department. Various communes of the Essonne département are named after it: Bures-sur-Yvette, Gif-sur-Yvette and Villebon-sur-Yvette.

The Yvette crosses the following départements and towns:

• Yvelines: Lévis-Saint-Nom, Dampierre-en-Yvelines, Saint-Forget, Chevreuse, Saint-Rémy-lès-Chevreuse
• Essonne: Gif-sur-Yvette, Bures-sur-Yvette, Orsay, Villebon-sur-Yvette, Palaiseau, Champlan, Saulx-les-Chartreux, Longjumeau, Chilly-Mazarin, Épinay-sur-Orge, Savigny-sur-Orge

Left bank:

• Ru du Pommeret
• Ruisseau de la Goutte d'Or
• Rhodon
• Mérantaise

Right bank:

• Ru des Vaux de Cernay
• Rouillon de Valence
• Ru d'Écosse-Bouton
• Ruisseau de Montabé
• Vaularon
• Ruisseau de Paradis
• Rouillon

• Vallée de Chevreuse