IEO may refer to:
- Independent Evaluation Office, of the World Bank
- International English Olympiad, a competition conducted by the Science Olympiad Foundation
- Istituto Europeo di Oncologia, the European Institute of Oncology
- Interior-Earth object or Atira asteroid
- Institut d'Estudis Occitans (Institute of Western Studies), a cultural organization
- Initial exchange offering
This disambiguation page lists articles associated with the title IEO.
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