OPR

OPR may refer to:

• Office of Population Research, the oldest population research center in the United States
• Office of Professional Responsibility, part of the United States Department of Justice responsible for investigating attorneys employed thereby who have been accused of misconduct or crimes in their professional functions
• Office of Public Roads, a predecessor of the United States Federal Highway Administration
• Official Pattern Release, used by Trend Micro to refer to the definitions for their antivirus products
• Output Recordings, a British independent record label run by Trevor Jackson, between 1996–2006
• Overall pressure ratio, the ratio of the stagnation pressure as measured at the front and rear of the compressor of a gas turbine engine
• Overnight Policy Rate, an overnight interest rate set by Bank Negara Malaysia used for monetary policy direction
• Rodrigues People's Organisation (Organisation du Peuple Rodriguais), a Mauritian political party

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