Étienne-Louis Boullée was a visionary French neoclassical architect whose work greatly influenced contemporary architects.

Born in Paris, he studied under Jacques-François Blondel, Germain Boffrand and Jean-Laurent Le Geay, from whom he learned the mainstream French Classical architecture in the 17th and 18th century and the Neoclassicism that evolved after the mid century. He was elected to the Académie Royale d'Architecture in 1762 and became chief architect to Frederick II of Prussia, a largely honorary title.

He designed a number of private houses from 1762 to 1778, though most of these no longer exist; notable survivors into the modern era include the Hôtel de Brunoy (demolished in 1930) and the Hôtel Alexandre, both in Paris. His work for François Racine de Monville has apparently also vanished but his probable influence on Monville's own architectural works as seen at the Désert de Retz speaks for itself. Together with Claude Nicolas Ledoux, he was one of the most influential figures of French neoclassical architecture.