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ONR may refer to:

  • Ontario Northland Railway in Ontario, Canada
  • Office for Nuclear Regulation in the United Kingdom
  • Office of Naval Research of the U.S. Navy
  • National Radical Camp (disambiguation) (Obóz Narodowo-Radykalny), several Polish nationalist organisations
  • Organisation for National Reconstruction, a defunct political party in Trinidad and Tobago
  • Air One Nine, Libya (ICAO airline code)
  • Otter Nelson River School, a high school located at Cross Lake, Manitoba, Canada
  • ON-Regel, a standard by the Austrian Standards Institute
  • Ohio Northern Region, one of the largest regions in BBYO