CEI may stand for:

• IATA airport code for Chiang Rai International Airport
• Conferenza Episcopale Italiana
• Central European Initiative
• Cleveland Electric Illuminating Company
• Common Electrical Interface, a hardware interoperability agreement defined by the Optical Internetworking Forum
• Competitive Enterprise Institute, a libertarian think-tank
• Cycle Engineers' Institute, a screw thread pattern (see British Standard Whitworth, which includes information on topic)
• Chief Executive Instruction
• Component Engineers Inc.
• Computational Engineering International
• Construction Engineering Inspection
• Cox Enterprises Incorporated
• Chicago and Eastern Illinois Railroad
• Constant Energy Ignition, a proprietary point-less ignition system manufactured by Lucas Industries
• Caretakers of the Environment International
• COMITATO ELETTROTECNICO ITALIANO, Electrotechnical Committee ITALIAN

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