| Société Canadienne de Science Animale | Academic & Science |
| Canadian Society of Animal Science | Academic & Science |
| Center for Student Academic Support | Academic & Science |
| Colorado Springs Astronomical Society | Academic & Science |
| Center for Student Achievement Solutions | Academic & Science |
| Core Science Analytics Synthesis | Academic & Science |
| Coal Smoke Abatement Society | Academic & Science |
| Center for Student Academic Success | Academic & Science |
| Climate Science Awareness and Solutions | Academic & Science |
| Canadian Science Advisory Secretariat | Business |
| Career Standards and Assessment Services | Business |
| Chattanooga School for the Arts and Sciences | Community |
| Committee on Standards and Academic Standing | Community |
| Community Safety Accreditation Scheme | Community |
| Community Supported Agriculture As | Community |
| Computer Science and Applied Statistics | Computing |
| Center for the Study of the American South | General |
| Command and Stability Augmentation System | General |
| Commissioning Support Appraisals Service | General |
| Classroom Strategy Assessment Scale | General |
| Command Stability Augmentation System | General |
| Commodity and Services Acquisition Service | General |
| Cougar Scholarship Awarding System | General |
| Control Stability Augmentation System | General |
| Criticality Safety Analysis Sequence | General |
| Customer Satisfaction Analysis System | General |
| Center for Snow and Avalanche Studies | General |
| Car Sharing Association of Singapore | General |
| Computerized Status Accounting System | Governmental |
| Center for South Asian Studies | International |
| Centre of South Asian Studies | International |
| Central Sleep Apnea Syndrome | Medical |
| Cultural Stress Anxiety Syndrome | Medical |
| Central Sleep Apnoea Syndrome | Medical |
| Central States Anthropological Society | Regional |
| Canadian Special Air Service | Regional |
