An intergovernmental organization whose stated objective is to "coordinate and unify the petroleum policies of member countries." It was created at the Baghdad Conference on September 10-14, 1960. Current members (with years of membership) include:

• Algeria (1969-present)
• Angola (2007-present)
• Ecuador (1973-1992 and 2007-present)
• Iran (1960-present)
• Iraq (1960-present)
• Kuwait (1960-present)
• Libya (1962-present)
• Nigeria (1971-present)
• Qatar (1961-present)
• Saudi Arabia (1960-present)
• United Arab Emirates (1967-present) and
• Venezuela (1960-present)

• Gabon (1975-1994)
• Indonesia (1962-2008)