CEI
Companies and organizations
- Competitive Enterprise Institute, a libertarian think-tank
- Council of Engineering Institutions, later the Engineering Council
- Cycle Engineers' Institute, a screw thread pattern, see British Standard Whitworth
- Episcopal Conference of Italy or Conferenza Episcopale Italiana
Other uses
- Central European Initiative, a forum of regional cooperation in Central and Eastern Europe
- Chicago and Eastern Illinois Railroad
- Common Electrical I/O, Interoperability Agreements
- Corporate Equality Index of US businesses regarding LGBT people
- IATA code for Mae Fah Luang – Chiang Rai International Airport, Thailand
- Child Exploitation Imagery, a category of illegal or harmful online content
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