EPI
- EF English Proficiency Index
- Echo-planar imaging
- Ecology Project International
- Economic Policy Institute
- Education Policy Institute
- Eletrophotonic imaging
- Ends per inch
- Enkhjargal Dandarvaanchig
- Entropy power inequality
- Environmental Performance Index
- Epi (island)
- Epi Taione
- Epi languages
- Epi-pen
- Epidemiology
- Epidendrum
- Epigraph (mathematics)
- Epimer
- Epimorphism
- Epinephrine
- Epinephrine (medication)
- Epiphyllum hybrid
- Episerver
- Epitaxy
- Ethical positioning index
- European Patent Institute
- European Payments Initiative
- European Processor Initiative
- Exocrine pancreatic insufficiency
- Expanded Program on Immunization
- Exploding Plastic Inevitable
- Extreme physical information
- Juan Antonio San Epifanio
- Portuguese India