ORP

ORP may refer to:

• Oxidation reduction potential, the tendency of a chemical species to acquire electrons and thereby be reduced
• Open Relevance Project, data and tools to compare the search relevancy performance of search engines
• Operational Ration Pack, a combat ration used by the British Armed Forces
• O'Reilly Raceway Park at Indianapolis, a motorsports racing facility in Indianapolis, Indiana
• Orpington railway station, in southeast London, England
• Okręt Rzeczypospolitej Polskiej, a traditional ship prefix in the Polish Navy meaning Vessel of the Republic of Poland

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