Wikipedia
IEI
IEI may mean:
- Idiopathic environmental intolerance, also known as multiple chemical sensitivity
- Individual Employment Income
- Institution of Engineers (India)
- Institut d'échanges interculturels
- Institution of Engineers of Ireland
- Intensive English Institute, at the University of Illinois in Urbana–Champaign
- Intuitive Ethical Introvert, in socionics theory
- Iran Engineering Inspection
- IEI Integration Corporation