| CEI | Calvert Electronics Inc 
| Others |
| CEI | Camber Energy Inc
| Others |
| CEI | Cape Eleuthera Institute
| Others |
| CEI | Carbon Enterprises Inc
| Others |
| CEI | Cation Exchange Index
| Others |
| CEI | Center for Economic Information
| Others |
| CEI | Center for Educational Innovation
| Others |
| CEI | Center for Elders Independence
| Others |
| CEI | Center for Elders' Independence
| Others |
| CEI | Center for Emerging Issues (United States Department of Agriculture)
| Others |
| CEI | Center for Energy Initiatives
| Others |
| CEI | Center for Entrepreneurial
| Others |
| CEI | Center for Entrepreneurial Innovation
| Others |
| CEI | Center for Entrepreneurship and Innovation
| Others |
| CEI | Center for Entrepreneurship Innovation
| Others |
| CEI | Central Entertainment Industries
| Others |
| CEI | Central Environmental Inc
| Others |
| CEI | Central European Initiative
| Others |
| CEI | Centre for Engineering Innovation
| Others |
| CEI | Certified Electrical Inspector
| Others |
| CEI | Certified Elevator Inspector
| Others |
| CEI | Certified Enterprise Integrator
| Others |
| CEI | Chalmers Environmental Initiative
| Others |
| CEI | Chicago and Eastern Illinois Railroad (Union Pacific Railroad)
| Others |
| CEI | Christian Educators International
| Others |
| CEI | Chrysler Electronic Ignition
| Others |
| CEI | Cincinnati Eye Institute
| Others |
| CEI | Civil Environmental and Industrial
| Others |
| CEI | Civilian Employer Information
| Others |
| CEI | Civilian Employment Information
| Others |
| CEI | Claim Evidence and Interpretation
| Others |
| CEI | Clean Energy Institute
| Others |
| CEI | Climate Extremes Index
| Others |
| CEI | Clinical Education Initiative
| Others |
| CEI | Cloud Excellence Implement
| Others |
| CEI | Cloud Excellence Implementer
| Others |
| CEI | Coastal Enterprises Inc
| Others |
| CEI | Collaboration Expertise and Innovation
| Others |
| CEI | Collections Effectiveness Index
| Others |
| CEI | College of Eastern Idaho
| Others |
| CEI | Colorado Education Initiative
| Others |
| CEI | COMINT/ ELINT (COMMunications INTelligence/ ELectronic INTelligence) Integration
| Others |
| CEI | Comitato Elettrotecnico Italiano
| Others |
| CEI | Commission Electorale Independante
| Others |
| CEI | Committee on Environmental Improvement
| Others |
| CEI | Communication Electronics Installation
| Others |
| CEI | Communications Electronics Instruction
| Others |
| CEI | Communications/ Electronics Intelligence
| Others |
| CEI | Comparably Efficient Interconnection
| Others |
| CEI | Competitive Enterprise Institute
| Others |
| CEI | Component End Item
| Others |
| CEI | Components Express Inc
| Others |
| CEI | Composite Efficiency Index
| Others |
| CEI | Comprehensive Energy International
| Others |
| CEI | Comprehensive Environmental Inc
| Others |
| CEI | Computational Engineering International
| Others |
| CEI | Computer Enterprises Inc
| Others |
| CEI | Computer Ethics Institute
| Others |
| CEI | Computing Entrepreneurship and Innovation
| Others |
| CEI | Comuni Esantemi Infantili
| Others |
| CEI | Concours Endurance Internationale
| Others |
| CEI | Conferenza Episcopale Italiana
| Others |
| CEI | Configurable Engine Immobilizer
| Others |
| CEI | Configuration End Item
| Others |
| CEI | Connection Endpoint Identifier
| Others |
| CEI | Construction Engineering Inspection
| Others |
| CEI | Construction Estimating Institute
| Others |
| CEI | Consultant Engineering Inc
| Others |
| CEI | Contagious Eye Infection
| Others |
| CEI | Contract End Item
| Others |
| CEI | Converting Equipment International
| Others |
| CEI | Core Envelope Interface
| Others |
| CEI | Corporate Equality Index
| Others |
| CEI | Creative Education Institute
| Others |
| CEI | Creative Engineering Incorporated
| Others |
| CEI | Creative Equipment International
| Others |
| CEI | Criminal Enterprise Investigations
| Others |
| CEI | Critical Employment Indicator
| Others |
| CEI | Cum Eating Instruction
| Others |
| CEI | Cum Eating Instructions
| Others |
| CEI | Cupertino Electric Inc
| Others |
| CEI | Current Environmental Issues
| Others |
| CEI | Custom Ecology Inc
| Others |
| CEI | Customer Experience Initiative
| Others |
| CEI | Cutting Edge International
| Others |
| CEI | Enterprises Inc
| Others |