PPO

PPO may refer to:

Law enforcement

 * Personal Protection Officer
 * Personal Protection Order
 * Police protection order
 * Prisons and Probation Ombudsman
 * Public prosecutor's office

Chemistry and biochemistry

 * 2,5-Diphenyloxazole, an organic scintillator
 * Polyphenol oxidases, a family of enzymes


 * Poly(p-phenylene oxide), a type of plastic


 * Propylene oxide, an industrial chemical
 * Protoporphyrinogen oxidase, an enzyme
 * Pure plant oil

Other uses

 * White House Presidential Personnel Office, the White House office tasked with vetting new appointees
 * Pfadfinder und Pfadfinderinnen Österreichs, an Austrian Scouting organization
 * Planned purchase order, part of the purchasing process
 * Polish Patent Office
 * Political Parties Order, 2002, a chief executive order in Pakistan
 * Preferred provider organization, a type of health insurance plan
 * Toray Pan Pacific Open, a Women's Tennis Association tournament
 * Philippine Philharmonic Orchestra
 * Abbreviation of Praefectus Praetorio (Praetorian Prefect), found on inscriptions
 * Proximal Policy Optimization, a family of reinforcement learning algorithms (part of computer science)
 * Pédagogie par Objectifs-Melkart 2021
 * Populist Party Ontario, a minor provincial political party in Ontario, Canada
 * Plant Phenology Ontology