ONR

ONR may refer to:

• Office for Nuclear Regulation in the United Kingdom
• Office of Naval Research of the U.S. Navy
• ONR (singer), stage name of Scottish singer Robert Shields
• Ontario Northland Railway in Ontario, Canada
• Organisation for National Reconstruction, a defunct political party in Trinidad and Tobago
• Otter Nelson River School, a high school in Manitoba, Canada
• Obóz Narodowo-Radykalny, three far-right fascist Polish nationalist organisations known as National Radical Camp
• ON-Regel, a standard by the Austrian Standards International
• ONR, the ICAO airline code for Air One Nine Company, Libya