The International Union of Pure and Applied Chemistry (IUPAC, or ) is an international federation of National Adhering Organizations that represents chemists in individual countries. It is a member of the International Council for Science (ICSU). The international headquarters of IUPAC is in Zürich, Switzerland. The administrative office, known as the "IUPAC Secretariat", is in Research Triangle Park, North Carolina, United States. This administrative office is headed by the IUPAC executive director, currently Lynn Soby.