Gargenville (French pronunciation: [ɡaʁʒɑ̃vil]) is a commune in the Yvelines department in the Île-de-France region in north-central France, 45 km to the center of Paris.

Before the French Revolution, Gargenville was made of two fiefs, the domaine d'Hanneucourt and the Moufle de la Tuilerie.

Public transportation is provided by Transilien on the Paris Saint Lazare to Mantes Station via Conflans-Sainte-Honorine line.

On the edge of the Seine, the territory is highly urbanized, in which residential areas and industries alternate.

The northern part of the canton, entirely included in the regional natural park, very wooded, more sparsely populated, is dedicated to traditional agriculture and forestry, crafts and tourism.