| Center for Economic and Social Studies | Academic & Science |
| Central Eurasian Studies Society | Academic & Science |
| Centre for European Security Studies | Academic & Science |
| Center for Experimental Social Science | Academic & Science |
| Centre for Experimental Social Sciences | Academic & Science |
| Centre for Earth Science Studies | Academic & Science |
| Central Eurasian Studies Society's | Academic & Science |
| Centre for Experimental Social Science | Academic & Science |
| Civil Engineering Students Society | Academic & Science |
| Civil Engineering Student S | Academic & Science |
| Clean Enviro Summit Singapore | Community |
| Counseling Educational Support Services | Community |
| Consumer Enterprise Service Software | Computing |
| Computer Equipment Software and Services | Computing |
| Computer Education Student Society | Computing |
| College of Education and Social Services | Educational Institute |
| College of Education and Social | Educational Institute |
| Coveo Enterprise Search for SharePoint | General |
| Coarse Earth Sun Sensor | General |
| Cold Engine Sensor Switch | General |
| Centre dexpertise en sante de Sherbrooke | General |
| Centre d'expertise en santé de Sherbrooke | General |
| Cation Exchange Specific Sorption | General |
| short for “assess”; the spelling is due to a mistaken connection with census | Governmental |
| Centre for Economic and Social Studies | Governmental |
| Civilian End Strength Study | Military and Defence |
| Centre for European Security Strategies | Regional |
| Conference of European Statistics Stakeholders | Regional |
| Computer Equipment Software Services | Softwares |
