Multilateral

Unrepresented Nations and Peoples Organisation (UNPO) - An international organisation created by nations and peoples around the world who are not represented as such in the world's principal international organisations, such as the United Nations.
http://www.unpo.org/

Bank for International Settlements (BIS) - Coordinates regulations in the fields of financial services to promote international financial stability. Publications available include a compendium of documents of the Basel Committee on Banking Supervision.
http://www.bis.org/

World Customs Organization (WCO) - Develops standards and provides technical support for the harmonization of procedures governing the movement of people and commodities.
http://www.wcoomd.org/ie/en/en.html

The Cairns Group - Trade group of 17 agricultural exporting countries, accounting for one-third of the world’s agricultural exports. Works for the reduction of tariffs, domestic subsidies and export subsidies.
http://www.cairnsgroup.org/

G24 - Intergovernmental Group of Twenty-Four on International Monetary Affairs and Development - Concerts the position of developing countries on monetary and development finance issues.
http://www.g24.org

Multi-Governmental Organizations - Extensive directory of web sites.
http://www.gksoft.com/govt/en/multi.html

Energy Charter - Legally-binding multilateral instrument that strengthens the rule of law on energy issues.
http://www.encharter.org/

International Organization for Migration (IOM) - Promoting humane and orderly policies in the movement of persons across borders. Supports migrant health protections, assisted returns, counter-trafficking, and technical cooperation in migration.
http://www.iom.int/

World Tourism Organization (WTO) - Global forum for tourism policy issues and a practical source of tourism know-how.
http://www.world-tourism.org/

Organization of the Petroleum Exporting Countries (OPEC) - Global organization dedicated to stability in and shared control of the petroleum markets.
http://www.opec.org/