DNO or Dno may refer to:
Organisations
- Danish Nurses' Organization, a trade union for nurses in Denmark
- Director of Naval Ordnance, British Admiralty administration
- Distribution network operator, companies licensed to distribute electricity in Great Britain
- DNO ASA, a Norwegian oil company
- Dutch National Opera, based in Amsterdam, the Netherlands
Places
- Dno, a town in Russia
- Dno (air base), a former air base near Dno