| Abbreviation | Definition |
|---|---|
| CSPI | Centre for Science in the Public Interest (Canadian Branch uses international spelling) |
| CSPIS | Center for Science in the Public Interest |
| CSPNJ | Collaborative Support Programs of New Jersey, Inc. |
| CSPO | Consortium for Science, Policy, and Outcomes |
| CSRR | Center for Student Rights and Responsibilities |
| CSS | Community and Senior Services |
| CSSLR | Committee to Save Silver Lakes Reservoirs |
| CSSMC | Catholic Social Services of Monroe County |
| CSSOC | Catholic Social Services of Oakland County |
| CSSR | Councils with Social Services Responsibility |
| CSSV | Catholic Social Services Victoria |
| CSSV | Conservation Society of Southern Vermont |
| CSSW | Catholic Social Services of Wayne County |
| CSSWAYNE | Catholic Social Services of Wayne County |
| CST | Community Security Trust |
| CSUF | Central State University Foundation |
| CSUF | Cleveland State University Foundation |
| CSUG | Canadian Society for Unconventional Gas |
| CSVAC | Center for Study of Violence Against Children |
| CSVC | Center for Social Value Creation |