Île Seguin (Seguin Island) is an island on the Seine river between Boulogne-Billancourt and Sèvres, in the west suburbs of Paris, France. It has a surface area of approximately 11.5 hectares (28 acres), and is positioned opposite Meudon, a short distance downstream from the Île Saint-Germain. Administratively Meudon and the island are included as part of Boulogne-Billancourt, on the river's right bank, rather than of Sèvres on the left bank.
During most of the twentieth century, Île Seguin was home to a Renault factory, covering virtually the whole island. The last car from the Renault production line was a 1992 Renault 5 Supercinq. The factory remained dormant until 2005 when all the buildings were demolished.
The architect Jean Nouvel is leading a project to turn the island into a cultural hub.
Coordinates: 48°49′25.61″N 2°13′59.67″E / 48.8237806°N 2.2332417°E
Before the seventeenth century the island was owned by the Abbey of St. Victor and the land was cultivated by tenant farmers.
The island's importance received a sudden boost at the end of the seventeenth century with the construction of a Palace at nearby Versailles, because it was positioned along the route that connected the new palace with Paris. The road was much frequented by itinerant . In 1747 the palace builder's grandson, Louis XV, acquired the island - then known as the "Île de Sève", on behalf of his daughters. The island found itself renamed as the "Île Madame", and during the pre-revolutionary decades it was home to a commercial laundry, the "Buanderie de Sèvres".