The International Union of Pure and Applied Chemistry (IUPAC) is an international non-governmental organization devoted to the advancement of chemistry. It has as its members national chemistry societies. It is the recognized authority in developing standards for the naming of chemical compounds, through its Interdivisional Committee on Nomenclature and Symbols (IUPAC nomenclature). It is a member of the International Council for Science (ICSU).

See also:

• Element naming controversy
• Periodic table group