Asnières-sur-Seine is a commune in the Hauts-de-Seine department and Île-de-France region of north-central France. It lies on the left bank of the river Seine, some eight kilometres from the centre of Paris in the north-western suburbs of the French capital. The inhabitants are called the Asniérois and the Asniéroises in French.

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.