PRR may refer to:

• Parietal reach region, of the human brain
• Pattern recognition receptor, receptors of the innate immune system that identify pathogen-associated molecular patterns
• Pennsylvania Railroad (reporting mark), an American railroad
• Personal Role Radio, a radio carried by UK troops
• Pichi Richi Railway, a heritage railway in South Australia
• Populist radical right, a loose collection of political ideologies
• Porsche Rennsport Reunion, an automotive event
• Princes Risborough railway station (National Rail station code), England
• Production Rule Representation, a proposed computing standard
• Proportional reporting ratio, a statistic used in data mining for health surveillance systems
• Pseudo-response regulator, a group of genes that are important in the circadian oscillator of plants
• Pure Reason Revolution, a British rock group formed in 2003
• Rio-grandense Republican Party (Portuguese: Partido Republicano Rio-Grandense), a defunct Brazilian political party

• PRRS (disambiguation)

This disambiguation page lists articles associated with the title PRR.
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