ONU may refer to:
- United Nations in other languages, e.g. French Organisation des Nations Unies, Spanish Organización de las Naciones Unidas and Portuguese Organização das Nações Unidas
- Olivet Nazarene University
- Ohio Northern University
- Optical Network Unit, the IEEE term for Optical Network Terminal
- Order of Nunavut
- Organizacion de Narcotraficantes Unidos, a Puerto Rican criminal organization
- Onu (pronoun), Polish neopronoun
This disambiguation page lists articles associated with the title ONU.
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