| Abbreviation | Definition |
|---|---|
| CSDN | Circadian Sleep Disorders Network |
| CSE | Center for Space Education |
| CSE | Centre for Science and Environment |
| CSEC | California Self Esteem Conference |
| CSEC | Connecticut State Employees Campaign |
| CSEF | Camps, Sports, and Excursions Fund |
| CSEF | Canadian Social Entrepreneurship Foundation |
| CSF | California Scholastic Federation |
| CSF | Canadian Schizophrenia Foundation |
| CSF | Children's Scholarship Fund |
| CSF | Children's Survival Fund |
| CSF | Community Solutions Fund |
| CSF | Competitiveness Support Fund |
| CSFA | California State Firefighters' Association |
| CSFA | Citizens' Scholarship Foundation of America |
| CSFA | Cultural Society of Filipino Americans |
| CSFD | Clarke School For the Deaf |
| CSFH | Campaign to Stop Funding Hate |
| CSFK | Civil Society Forum Kashmir |
| CSFN | Coalition for San Francisco Neighborhoods |