What is the underground lobby beneath the Louvre Pyramid called?

The underground lobby beneath the Louvre Pyramid is called Hall Napoléon.

Hall Napoléon is the vast subterranean visitor space at the heart of the Grand Louvre project. It sits beneath the Cour Napoléon, directly below I. M. Pei’s glass Pyramid, and distributes visitors toward the museum’s three principal wings: Denon, Sully, and Richelieu.

The lobby was part of a major modernization effort commissioned during François Mitterrand’s presidency. The Pyramid and its underground complex opened on 29 March 1989, creating a central entrance capable of handling the Louvre’s growing crowds while keeping the historic palace façades largely intact.

Hall Napoléon is not the same as the archaeological remains displayed below the courtyard. Those include the medieval Louvre’s moat, the ditch around its former keep, and the Salle Saint-Louis. Galerie d’Apollon and Cour Puget are named gallery or courtyard spaces elsewhere in the museum, not the central underground lobby.

The name also distinguishes this entrance complex from the Pyramid itself: the Pyramid admits daylight from above, while Hall Napoléon contains the circulation, ticketing, shops, and visitor services below ground.