| Acronym | Definition |
|---|
| PET | Positron Emission Tomography |
| PET | Parent Effectiveness Training |
| PET | Personal Electronic Transactor (early Commodore PC) |
| PET | Peter (New Testament) |
| PET | Petroleum |
| PET | Polyethylene Terephthalate (more common than PETE) |
| PET | Preliminary English Test |
| PET | Peten (Guatemala territorial division) |
| PET | Programa de Educação Tutorial (Portuguese: Education Program Tutorial; Brazil) |
| PET | Privacy Enhancing Technologies (Symposium) |
| PET | Politiets Efterretningstjeneste (Danish for Police Intelligence Agency) |
| PET | Petroleum Ether |
| PET | Potential Evapotranspiration |
| PET | Post-Exposure Treatment (rabies vaccination) |
| PET | Pierre Elliot Trudeau (former Canadian Prime Minister) |
| PET | Programa de Empleo Temporal (Spanish: Temporary Employment Program; Mexico) |
| PET | Photoinduced Electron Transfer |
| PET | Programming Environment and Training (HPCMP) |
| PET | Privacy Enhancing Technology |
| PET | Potentially Exempt Transfer (UK inland revenue) |
| PET | Personal Terminal (MegaMan, gaming) |
| PET | Pupil Evaluation Team |
| PET | Pre-Eclamptic Toxaemia |
| PET | Positron Emissie Tomografie (Dutch) |
| PET | Performance Evaluation Tool |
| PET | Print Enhancement Technology |
| PET | Priority Encoding Transmission (algorithm) |
| PET | Piezoelectric Transformer |
| PET | Persuasion Emotion and Trust |
| PET | Proton Electron Telescope |
| PET | Precision End Trimmed (lumber) |
| PET | Presidential Electoral Tribunal (Philippines) |
| PET | Performance Evaluation Test |
| PET | Productivity Enhancement and Technology |
| PET | User Productivity Enhancement and Technology Transfer (Previously Productivity Enhancement and Technology) |
| PET | Piezo-Electric Transducer |
| PET | Phase Elapsed Time |
| PET | Performance Evaluation Team |
| PET | Portable Electronic Thermometer |
| PET | Pet Energy Therapy |
| PET | Pile Echo Tester (system for testing piles/shafts/deep foundations) |
| PET | Project Execution Team |
| PET | Personal Electronic Thingy |
| PET | Professional Employment Training |
| PET | Protected Entrance Terminal |
| PET | Product Enterprise Team (US Navy) |
| PET | Proposal Evaluation Tool |
| PET | Piston Engine Technology |
| PET | Polling Every Time |
| PET | Permanent Engaged Tone |
| PET | Production Environmental Test |
| PET | Process Enhancement Team |
| PET | Propulsion Engineering Trainer |
| PET | Peak Engine Torque |
| PET | Parker Endotracheal Tube |
| PET | Pilot-Line Experiment Technology |
| PET | Pulse Energy Thermography |
| PET | Phase Emission Tomography |
| PET | Precision Electric Turret |
| PET | Physical Education Teacher (various schools) |
| PET | Paraffin-Embedded Tissue |
| PET | Plan de Expansión de Transmisión (Spanish: Transmission Expansion Plan) |
| PET | Preservative Efficacy Test |