Longpont-sur-Orge (French pronunciation: [lɔ̃pɔ̃ syʁ ɔʁʒ] ⓘ, literally Longpont on Orge) is a commune in the Essonne department in Île-de-France in northern France.

From 1954 to 1962, the villa in Longpont-sur-Orge owned by William and Noma Copley served as a social hub and a central gathering place in the postwar era for a community of Surrealists to reunite after their dispersal during the war.

Among the artists who frequented the villa located at 27, rue du Docteur Darier were Man Ray, Henri Matisse, Marcel Duchamp, Roland Penrose, Lee Miller, and British architect Maxwell Fry.

[3][4] Brico Dépôt, a subsidiary of Kingfisher plc, has its head office in Longpont-sur-Orge.

Two nearby secondary schools, Collège Jean Moulin (junior high school) and Lycée Léonard de Vinci are in nearby Saint-Michel-sur-Orge.