Hauts-de-Seine is a landlocked department in the Île-de-France region, Northern France. It covers Paris's western inner suburbs. It is bordered by Paris, Seine-Saint-Denis, and Val-de-Marne to the west, Val-d'Oise to the north, Yvelines to the east and Essonne to the south. With a population of 1,603,268 (as of 2016) and a total area of 176 square kilometres (68 square miles), it is the second most highly densely populated department of France after Paris. It is the fifth most populous department in France. Its prefecture is Nanterre although Boulogne-Billancourt, one of its two subprefectures alongside Antony, has a larger population.

Hauts-de-Seine is best known for containing the modern office, cinema and shopping complex La Défense, one of Grand Paris's main economic centres and one of Europe's major business districts. Hauts-de-Seine is one of the wealthiest department in France; it has the highest GDP per capita at €104,000 in 2016. Its inhabitants are called Altoséquanais in French.

From 1790 to 1968, Hauts-de-Seine was part of the former department of Seine.

The Hauts-de-Seine department was created in 1968, from parts of the former departments of Seine and Seine-et-Oise. Its creation reflected the implementation of a law passed in 1964; Nanterre had already been selected as the prefecture for the new department early in 1965.

In 2016, the Departmental Council of Hauts-de-Seine voted in favour of a fusion of Hauts-de-Seine and Yvelines, its western neighbour. Following a similar vote in Yvelines, an établissement public interdépartemental was established. The fusion will proceed if voters in both departments return a favourable majority of councillors in the 2021 elections. The name Seine-et-Oise (department abolished in 1968) has been discussed for a new department.

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