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