| Acronym | Definition |
|---|
| PEM | Privacy-Enhanced Mail (key encryption services for email) |
| PEM | Proton Exchange Membrane |
| PEM | Polymer Electrolyte Membrane |
| PEM | Peabody Essex Museum |
| PEM | Protein Energy Malnutrition |
| PEM | Power Entry Module |
| PEM | Public Expenditure Management |
| PEM | Pacific Exploratory Mission (NCAR Atmospheric Chemistry Division) |
| PEM | Pearson Educational Measurement |
| PEM | Power Electronics Module |
| PEM | Polymorphic Epithelial Mucin |
| PEM | Polioencephalomalacia |
| PEM | Particle Environment Monitor |
| PEM | Plastic Encapsulated Microcircuits |
| PEM | Program Element Monitor |
| PEM | Port Expansion Module |
| PEM | Production Efficiency Model |
| PEM | Penn Engineering & Manufacturing Corp. |
| PEM | Plesk Enterprise Manager (Plesk) |
| PEM | Photoelectromagnetic |
| PEM | Parabolic Equation Method |
| PEM | Photoelectron Microscopy |
| PEM | Personal Environmental Module |
| PEM | Public Ethernet Manager |
| PEM | Project Execution Model |
| PEM | Packaged Equipment Module |
| PEM | Program Engineering Manager |
| PEM | Program Element Manager |
| PEM | Project Element Manager |
| PEM | Personal Exposure Model |
| PEM | Partial Equilibrium Multimarket Model |
| PEM | Properties, Events, Methods (object-oriented programming) |
| PEM | Production Engineering Measure |
| PEM | Process Execution Module |
| PEM | Policy Enforcement Manager |
| PEM | Project Engineering Metrics |
| PEM | Program Execution Manager |
| PEM | Power Engineering & Manufacturing (Waterloo, IA) |
| PEM | Partial Environment Monitor |
| PEM | Processor Enhancement Module |
| PEM | Performance Evaluation Meeting |
| PEM | Payload Ejection Mechanism |
| PEM | Phased Equipment Modernization |
| PEM | Physical Education Management |
| PEM | Pressure Equalizing Module |
| PEM | Physics Environment Monitoring |
| PEM | Potentially Explosive Material |
| PEM | Pontiac Enthusiast Magazine |
| PEM | Psychological & Educational Measure |
| PEM | Programme Engrais Malagasy (Malagasy Fertilizer Program) |
| PEM | Performance-Enhancing Module |
| PEM | Program Endorsement Memorandum |
| PEM | Power & Environment Monitor |
| PEM | Preliminary Engineering Model |
| PEM | Position Entry Module |
| PEM | Professional Energy Manager (job title) |