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OPEC headquarters in Vienna

The Organization of the Petroleum Exporting Countries (OPEC) is an intergovernmental organization of 14 countries as of May 2017, made up of Algeria, Angola, Ecuador, Equatorial Guinea, Gabon, Iran, Iraq, Kuwait, Libya, Nigeria, Qatar, Saudi Arabia, United Arab Emirates, and Venezuela. The organization has maintained its headquarters in Vienna since 1965, and hosts regular meetings among the oil ministers of its Member Countries.