members - (35) Antigua and Barbuda, Argentina, The Bahamas, Barbados, Belize, Bolivia, Brazil, Canada, Chile, Colombia, Costa Rica, Cuba (excluded from formal participation since 1962), Dominica, Dominican Republic, Ecuador, El Salvador, Grenada, Guatemala, Guyana, Haiti, Honduras, Jamaica, Mexico, Nicaragua, Panama, Paraguay, Peru, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Suriname, Trinidad and Tobago, US, Uruguay, Venezuela
observers - (56) Algeria, Angola, Armenia, Austria, Azerbaijan,
Belgium, Bosnia and Herzegovina, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Egypt, Equatorial Guinea, Estonia, EU, Finland,
France, Georgia, Germany, Ghana, Greece, Holy See, Hungary, India,
Ireland, Israel, Italy, Japan, Kazakhstan, South Korea, Latvia,
Lebanon, Morocco, Netherlands, Norway, Pakistan, Philippines, Poland,
Portugal, Qatar, Romania, Russia, Saudi Arabia, Serbia and Montenegro,
Slovakia, Spain, Sri Lanka, Sweden, Switzerland, Thailand, Tunisia,
Turkey, Ukraine, UK, Yemen
Organization of Arab Petroleum Exporting Countries (OAPEC): established - 9 January 1968
aim - to promote cooperation in the petroleum industry
members - (11) Algeria, Bahrain, Egypt, Iraq, Kuwait, Libya, Qatar, Saudi Arabia, Syria, Tunisia, UAE
Organization of Eastern Caribbean States (OECS): established - 18 June 1981; effective - 4 July 1981
aim - to promote political, economic, and defense cooperation
members - (7) Antigua and Barbuda, Dominica, Grenada, Montserrat, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines
associate members - (2) Anguilla, British Virgin Islands
Organization of Petroleum Exporting Countries (OPEC): established - 14
September 1960