| Common Core State Standards | Academic & Science |
| Center for Civil Society Studies | Academic & Science |
| Cambodian Civil Society Strengthening | Academic & Science |
| Campus and Community Student Services | Academic & Science |
| Center for Catalysis and Surface Science | Academic & Science |
| Certified Cloud Security Specialist | Business |
| Children's Corrective Surgery Society | Community |
| Cass Community Social Services | Community |
| Comprehensive Community Support Services | Community |
| California Council for the Social Studies | Community |
| Consolidated Community School Services | Community |
| Comprehensive Community Service System | Community |
| Central Community School System | Community |
| Community Counseling Supportive Services | Community |
| Chinese Character Synthesis System | Computing |
| Common Computing Security Standards | Computing |
| Center for Cyber Security Studies | Computing |
| Center for Computer Systems Security | Computing |
| Canada's Cyber Security Strategy | Computing |
| Communications Circuits and Sensing Systems | General |
| Common Configuration Scoring System | General |
| Cross Channel Sales and Services | General |
| Crescent City Sound Studios | General |
| Chinese Character Syn thesis | General |
| Common Core States Standards | General |
| Centre for Complex Systems Studies | General |
| Center for Complex System Studies | General |
| Common Channel Signaling System | General |
| Command Commodity Standard System | General |
| Centrifugally Cast Stainless Steel | General |
| Car Customer Satisfaction Study | General |
| Chevrolet Camaro Super Sport | General |
| Combat System and Command Support System Directorate | Governmental |
| Command and Control Support System | Governmental |
| Comanche Crew Support System | Governmental |
| Commodity Command Standard System | Governmental |
| Caja Costarricense de Seguro Social | International |
| Clinical Care Support System | Medical |
| Childhood Cancer Survivor Study | Medical |