| c&en | Chemical and Engineering News 
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| CEN | Can't Engineer Nothing
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| CEN | Career and Education Network
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| CEN | Center for Educational Networking
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| CEN | Center for Electron Nanoscopy
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| CEN | Central Air
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| CEN | Central Educational Network
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| CEN | Central European Norm
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| CEN | Central, Hong Kong
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| CEN | centromere
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| CEN | Certificate for Emergency Nursing
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| CEN | Certification in Emergency Nursing
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| CEN | Certified Emergency Nurse
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| CEN | Certified Emergency Nursing
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| CEN | Chemical Engineering News
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| CEN | Chicagoland Environmental Network
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| CEN | Chicken Erythrocyte Nuclei
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| CEN | Ciudad Obregon, Mexico
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| CEN | Clinical and Experimental Nephrology
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| CEN | Clinical Emergency Nurse
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| CEN | Clinical Experimental Network
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| CEN | Cloud Enabled Networking
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| CEN | Coinsuper Ecosystem Network
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| CEN | Comite Europeen de Normalisation
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| CEN | Comite Europeen de Normalisation (European Committee for Standardisation)
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| CEN | Commission for European Normalization
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| CEN | Committee Europeen de Normalisation
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| CEN | Committee for Standardisation
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| CEN | Community Empowerment Network (!)
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| CEN | Connecticut Education Network
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| CEN | Consumer Electronics Net
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| CEN | Cornell Entrepreneur Network
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| CEN | Counter Enable
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| CEN | Creative Entertainment Network
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| CEN | Cross Eyed Ninja
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| CEN | Customer Enterprise Network
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| CEN | Cyber Erotic Noseplay
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| CEN | EuropeanCommittee for Standardization
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