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
{{ill|Independent Electoral Commission (Ivory Coast)|lt=Commission électorale indépendante (Ivory Coast)|de|Unabhängige Wahlkommission (Elfenbeinküste)|fr|Commission électorale indépendante (Côte d'Ivoire)}} or Independent Electoral Commission, body that oversees elections in Ivory Coast
Competitive Enterprise Institute, an American libertarian think tank
{{lang|it|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