ORP

ORP may refer to:
 * Operational Ration Pack, UK military
 * Operational Readiness Plan
 * Operational Readiness Platform (ORP)
 * Orpington railway station, Bromley, England
 * O'Reilly Raceway Park at Indianapolis
 * Oxidation reduction potential in chemistry
 * Okręt Rzeczypospolitej Polskiej, a Polish Navy ship prefix