The International Bureau of Weights and Measures (French: Bureau international des poids et mesures (BIPM)) is an intergovernmental organization that was established by the Metre Convention, through which member states act together on matters related to measurement science and measurement standards. The organisation is usually referred to by its French initialism, BIPM. The BIPM's headquarters is based at Sèvres, France. It has custody of the International Prototype Kilogram and houses the secretariat for this organization as well as hosting its formal meetings.
The BIPM reports to the International Committee for Weights and Measures (French: Comité international des poids et mesures, CIPM), a directorate of twelve members that meet biannually, which is in turn overseen by periodic meetings of the democratic international organization, consisting of delegates from all member states, the General Conference on Weights and Measures (French: Conférence générale des poids et mesures, CGPM). These organizations are also commonly referred to by their French initialisms.