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