DNU or Dnu may refer to:
- The New University Hospital (DNU), the largest single hospital in Denmark
- DAT LT, the ICAO airline code DNU
- ISO 639:dnu, the ISO 639-3 code for Danau language
- Necessity and Urgency Decree (in Spanish, "Decreto de necesidad y urgencia"), a special kind of order issued by the President of Argentina
- Dnu Huntrakul, a prominent Thai composer and chamber musician
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