IEA can be:

• Institute of Economic Affairs
• N.N. Miklukho-Maklai Institute of Ethnology and Anthropology, Moscow
• Institute of International and European Affairs, formerly the Institute of European Affairs
• Instituto Español de Andorra, a Spanish international school in Andorra
• International Association for the Evaluation of Educational Achievement
• International Energy Agency, an organisation
• International Epidemiological Association
• International Ergonomics Association
• Interscholastic Equestrian Association
• Islamic Emirate of Afghanistan, the de-facto government of Afghanistan

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