The École Supérieure des Sciences Economiques et Commerciales, more commonly known as ESSEC Business School or simply ESSEC, is a business school and grande école based in France. Founded in 1907, its principal campus is located in Cergy in the île-de-France region, but also has locations in La Défense, Rabat, and Singapore.

Cergy is a commune in the French department of Val-d'Oise, to the northwest of Paris. It is located 27.8 km (17.3 mi) from the centre of Paris, in the "new town" of Cergy-Pontoise, created in the 1960s, of which it is the central and most populated commune.