Nanterre is the prefecture of the Hauts-de-Seine department in the western suburbs of Paris, France. It is located some 11 km (6.8 mi) northwest of the centre of Paris. In 2018, the commune had a population of 96,807.

Hauts-de-Seine is a department in the Île-de-France region of France. It covers Paris's western inner suburbs. It is bordered by Paris, Seine-Saint-Denis and Val-de-Marne to the east, Val-d'Oise to the north, Yvelines to the west and Essonne to the south. With a population of 1,624,357 and a total area of 176 square kilometres, it has the second highest population density among all departments of France, after Paris. It is the fifth most populous department in France. Its prefecture is Nanterre, but Boulogne-Billancourt, one of its two subprefectures, alongside Antony, has a larger population.