ONU may refer to:

• United Nations in other languages, e.g. FrenchOrganisation des Nations Unies, SpanishOrganización de las Naciones Unidas and PortugueseOrganização das Nações Unidas
• Olivet Nazarene University
• Ohio Northern University
• Optical Network Unit, the IEEE term forOptical Network Terminal
• Order of Nunavut
• Organizacion de Narcotraficantes Unidos, a Puerto Rican criminal organization
• Onu (pronoun), Polish neopronoun

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