Pavillon de Breteuil

Pavillon de Breteuil is a building located in Saint-Cloud, France near Paris. It was inaugurated by Louis XIV in 1672. It is in the park of the former royal Château de Saint-Cloud, which was destroyed in 1870.

The building had been used since 1875 by the International Bureau of Weights and Measures (French: Bureau international des poids et mesures). Following an agreement signed on 25 April 1969 between the International Committee for Weights and Measures (French: Comité international des poids et mesures) (CIPM) and the French government, contrary to popular belief, the Pavilion de Breteuil does not enjoy extraterritoriality but only partial immunity.