The Organisation of Petroleum Exporting Countries (OPEC) is a permanent inter - governmental organisation composed of member states whose economies mostly rely on revenues from oil export. The OPEC’s twelve members work together to coordinate the overall oil price in the world market. So far, there have been numerous studies on OPEC’s influence on the world petroleum market. Current study, manly looks at the role of OPEC in development of the member countries. Investigates what kind of benefits does the member countries get from being member of the Organisation of Petroleum Exporting Countries and its influence on the economic development of the member countries.