| Acronym | Meaning |
 | PDU | Police Dog Unit - Power Distribution Unit - Protocol Data Unit |
| PE | Ice Pellets (old Style METAR Code) - Peru (ISO 3166 And FIPS 10-4 Country Code Digram) -Physical Education - Premature Ejaculation -Prince Edward Island (postal Code) Price To Earning Ratio (used For Equity Shares) |
| PEBCAC | Problem Exists Between Chair And Computer (IT Help Desk In-joke) |
| PEBKAC | Problem Exists Between Keyboard And Chair (ditto) |
| PEEK | PolyEtherEtherKetone |
| PEET | Partnerships For Enhancing Expertise In Taxonomy |
| PEI | Prince Edward Island - PolyEtherImide |
| PEK | PolyEtherKetone |
| PEN | Peruvian Sol (ISO 4217 Currency Code) -PolyEthylene Naphthalate |
| PEO | ?…??????… ???…‡??? ???†???‰?… (Greek For Pancyprian Federation Of Labour) - Philanthropic Educational Organization - PolyEthylene Oxide - Professional Employer Organization - Professional Engineers Ontario |
| PEPFAR | President's Emergency Plan For AIDS Relief |
| PER | Peru (ISO 3166 Trigram) |
| PERL | Usually Lower Case Practical Extraction And Report Language |
| PES | PolyEtherSulfone |
| PEST | UK Public Engagement With Science And Technology |
| PET | Personal Electronic Transactor - Pierre Elliott Trudeau - Positron Emission Tomography (as In PET Scan) - PolyEthylene Terephthalate (plastic) -Preliminary English Test |
| PETA | Pentaerythritol Triacrylate - People Eating Tasty Animals - People For The Ethical Treatment Of Animals |
| PETE | PolyEthyleneTErephthalate |
| PETP | PolyEthyleneTerePhthalate |
| PF | French Polynesia (ISO 3166 Digram) - Petafarad -Phenol Formaldehyde (resin) |
| PF | Picofarad |
| PFE | Permanent Forest Estate |
| PFLAG | Parents |
| PFO | Pissed |
| PFP | Partnership For Peace |
| PG | Papua New Guinea (ISO 3166 Digram) -Parental Guidance (rating) |
| PG | Petagram |
| PG | Picogram |
| PG&E | Pacific Gas & Electric |
| PGCE | Postgraduate Certificate In Education |
| PGD | Pre-implantation Genetic Diagnosis |
| PGENI | Pharmaco-Genetics For Every Nation Initiative |
| PGH | Pre-implantation Genetic Haplotyping |
| PGK | Papua New Guinea Kina (ISO 4217 Currency Code) |
| PGM | Precision-Guided Munition |
| PGP | Pretty Good Privacy |
| PH | Passive Homing (missile Guidance System) -petahenry - Philippines (ISO 3166 Digram) -Probability Of Hit - Public Health - Purple Heart |
| PH | Parts Of Hydrogen (acidity/alkalinity Index) - Picohenry |
| PH.D. | Philosophi? Doctor (Latin |
| PHA | PolyHydroxyAlkanoate -Potentially Hazardous Asteroid |
| PHL | Philippines (ISO 3166 Trigram) |
| PHP | Philippine Peso (ISO 4217 Currency Code) -PHP: Hypertext Preprocessor (originally Personal Home Page (Tools)) |
| PI | PolyImide - PolyIsoprene - Private Investigator |
| PI | P?li Language (ISO 639-1 Code) |
| PI | Pebi |
| PIB | PolyIsoButylene |
| PICNIC | Problem In Chair Not In Computer |
| PICS | Private Investment Capital Subscription |
| PID | Pelvic Inflammatory Disease -Plan Identification Number - Positive Identification - Procedural Identification -Procurement Identification Description |
| PIF | Partners In Flight |
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