RNU or rnu may stand for:
- Republican Network for Unity, Northern Ireland
- Russian National Union, Russia
- Russian National Unity, Russia
- Russian National Unity (2000), Russia. Organization after the split with the founder A. Barkashov.
- RNU, Ranau Airport, Malaysia
- Radiodifusión Nacional del Uruguay
- rnu (Rowett nude), a hairlessness gene in laboratory rats
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