| Abbreviation | Definition |
|---|---|
| CSFN | Coalition of San Francisco Neighborhoods |
| CSG | Community Service Grant |
| CSG | Council of State Governments |
| CSGV | Coalition to Stop Gun Violence |
| CSI | Corporate Social Investment |
| CSIF | Calgary Society of Independent Filmmakers |
| CSIR | Council for Scientific and Industrial Research |
| CSIS | Centre for Strategic and International Studies |
| CSLF | California State Library Foundation |
| CSLHS | Conference of State and Local Historical Societies |
| CSLS | Centre for the Study of Living Standards |
| CSM | Catholic Services of Macomb |
| CSNBI | Conseil sentiers NB Inc. (see NBTCI) |
| CSNYC | The New York City Foundation for Computer Science Education |
| CSO | Civil Society Organisation |
| CSO | Civil Society Organization |
| CSO | Civil society organizations |
| CSO | Community Services of Oakland County, Michigan |
| CSP | Coalition to Save the Preserves |
| CSPF | California State Parks Foundation |