| Acronym | Definition |
|---|
| EPI | Epidemiology |
| EPI | Epidermis |
| EPI | Expanded Programme on Immunization (World Health Organization) |
| EPI | Environmental Performance Index |
| EPI | Epinephrine (adrenaline) |
| EPI | Epithelium |
| EPI | Epitaxy |
| EPI | Equipamento de Proteção Individual (Portuguese: Personal Protective Equipment) |
| EPI | Exocrine Pancreatic Insufficiency |
| EPI | Employment Policies Institute (Washington, DC, USA) |
| EPI | Europrop International (European aero engines) |
| EPI | Emergency Public Information (US Department of Energy) |
| EPI | Enseignement Public et Informatique (French: Public Education and Information) |
| EPI | Escola Prática de Infantaria (Portuguese: Practical School of Infantry) |
| EPI | Environmental Performance Indicator |
| EPI | Environmental Policy Institute (St. Catharines, Ontario, Canada) |
| EPI | Electrochemical Products, Inc. (New Berlin, Wisconsin) |
| EPI | Energy Per Instruction |
| EPI | External Presentation Interface |
| EPI | Experimental Performance Institute |
| EPI | Engineering Process Improvement |
| EPI | Environmental Professional Intern (IPEP) |
| EPI | Energiepreisindex (energy price index of EVA; Austria) |
| EPI | External Peripheral Interface (Stellaris) |
| EPI | Emily Post Institute |
| EPI | Environmental Priorities Initiative |
| EPI | Ecumenical Peace Institute (Berkeley, CA) |
| EPI | Electronic Petrol Injection |
| EPI | Enterprise Process Improvement |
| EPI | Extraordinary Pay Increase |
| EPI | Electronic Processing Interchange |
| EPI | Estimated Premium Income |
| EPI | Enhanced Publisher Integration |
| EPI | Exit Planning Institute |
| EPI | Engine Performance Indicator |
| EPI | Equivalent Premium Income (insurance) |
| EPI | Expanded Position Indicator |
| EPI | External Project Initiation (WorldCom) |
| EPI | Exceptional Performance Incentive |
| EPI | European Participating Industries |
| EPI | Extended Phase Interferometry |
| EPI | Equipement de Protection Individuelle (French: personal protective equipment (climbing)) |
| EPI | Election Products Inc (Urbanna, VA) |
| EPI | Educator Preparation Institute |
| EPI | Entertainment Publications, Inc. (Troy, MI) |
| EPI | Electronic Publishing Information |
| EPI | Export Promotion and Internationalisation (Finland) |
| EPI | Endo Pharmaceuticals, Inc. (Newark, DE) |
| EPI | Evidence of Property Insurance |
| EPI | Engineering Projects India Ltd. |
| EPI | Exploration Production, Inc. (est. 1993; Canada) |
| EPI | Echo Planar Imaging |
| EPI | Economic Policy Institute |
| EPI | Electronic Position Indicator |
| EPI | Eagle-Picher Industries |
| EPI | Equipo de Protección Individual (Spanish: Personal Protective Equipment) |