ONU may refer to:
- United Nations in other languages, e.g. French Organisation des Nations unies and Arabic: منظمة الأمم المتحدة
- Olivet Nazarene University
- Ohio Northern University
- Optical Network Unit, the IEEE term for what is called an Optical Network Terminal in ITU-T terminology
- Organizacion de Narcotraficantes Unidos, a Puerto Rican criminal organization
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