ORP may refer to:
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Okręt Rzeczypospolitej Polskiej, a Polish Navy ship prefix
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Operational Ration Pack, UK military
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Orpington railway station
Orpington railway station is on the South Eastern Main Line, serving the town of Orpington in the London Borough of Bromley, south-east London. It is down the line from London Charing Cross and is situated between and stations. It is in Trav ...
, Bromley, England
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O'Reilly Raceway Park at Indianapolis
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Oxidation reduction potential
Redox potential (also known as oxidation / reduction potential, ''ORP'', ''pe'', ''E_'', or E_) is a measure of the tendency of a chemical species to acquire electrons from or lose electrons to an electrode and thereby be reduced or oxidised respe ...
in chemistry
{{disambiguation