Le Sphinx was a maison close (brothel) in Paris in the 1930s and 1940s. Along with the "Le Chabanais" and "One-Two-Two" it was considered one of the most luxurious and famous Parisian brothels.

The authorities of medieval Paris attempted to confine prostitution to a particular district. Louis IX (1226–1270) designated nine streets in the Beaubourg Quartier where it would be permitted. In the early part of the 19th century, state-controlled legal brothels started to appear in several French cities. By law, they had to be run by a woman, and their external appearance had to be discreet. The maisons were required to light a red lantern when they were open, and the prostitutes were only permitted to leave the maisons on certain days and only if accompanied by its head. By 1810, Paris alone had 180 officially approved brothels.