Neuilly-sur-Seine (French pronunciation: [nøji syʁ sɛn] ; lit. 'Neuilly-on-Seine'), also known simply as Neuilly, is an urban commune in Hauts-de-Seine, Île-de-France, France. An immediate western suburb of Paris, it is physically separated from the capital centre only by the Périphérique to its east and the Bois de Boulogne to its south.
Neuilly is mainly made up of residential neighborhoods and hosts several corporate headquarters and foreign embassies. One of the most affluent areas of France, it is the wealthiest and most expensive suburb of Paris. Although, as of 2020, it is the commune with only the fourth highest median per capita income (€52,570 per year) in France, if Neuilly is grouped together with the city’s adjacent 16th and 17th arrondissements, they form the most affluent residential area in the country.