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
  • OkrÄ™t Rzeczypospolitej Polskiej, a traditional ship prefix in the Polish Navy meaning Vessel of the Republic of Poland