CEI

CEI may refer to:

Organizations

 * Central European Initiative, a forum of regional cooperation in Central and Eastern Europe
 * Clean Energy Institute, a renewable energy research institute at the University of Washington, in Seattle, Washington, US
 * Cleveland Electric Illuminating Company, a defunct American utility company
 * College of Eastern Idaho, a public community college in Idaho Falls, Idaho, US
 * Commission électorale indépendante (Democratic Republic of the Congo) or Independent Electoral Commission, former name of the Independent National Electoral Commission
 * Independent Electoral Commission (Ivory Coast) or Independent Electoral Commission, body that oversees elections in Ivory Coast
 * Competitive Enterprise Institute, an American libertarian think tank
 * Conferenza Episcopale Italiana or Episcopal Conference of Italy, conference of Roman Catholic bishops
 * Council of Engineering Institutions, later the Engineering Council, a British regulatory authority
 * Creative Engineering, Inc., American company
 * Cycle Engineers' Institute, a screw thread pattern, see British Standard Whitworth

Other uses

 * Chicago and Eastern Illinois Railroad
 * Child exploitation imagery, a category of illegal or harmful online content
 * Common Electrical I/O, interoperability agreements
 * Comparably efficient interconnection
 * Corporate Equality Index of US businesses regarding LGBT people
 * IATA code for Chiang Rai International Airport, Thailand