EIU may refer to:

• Eastern Illinois University, a University in Charleston, Illinois (USA)
• Economist Intelligence Unit, a research and advisory company
• European University Institute, an international postgraduate and post-doctoral institute
• Extended Unique Identifier, a type of Organizationally Unique Identifier

Eastern Illinois University is a state University located in Charleston, Illinois. The Economist Intelligence Unit ( EIU) is part of The Economist Group. The European University Institute (EUI in Florence ( Italy) is an international postgraduate and post-doctoral teaching and research An Organizationally Unique Identifier ( OUI) is a 24-bit number that is purchased from the Institute of Electrical and Electronics Engineers Incorporated (IEEE

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