| Abbreviation | Definition |
|---|---|
| CSCF | Cherokee Strip Community Foundation |
| CSCF | Children's Sickle Cell Foundation |
| CSDF | Connecticut State Dental Foundation |
| CSEF | Clarence Schools Enrichment Foundation |
| CSEF | Clinical Science and Education Foundation |
| CSF | Caribbean Science Foundation |
| CSF | College Success Foundation |
| CSFN | Civil Society Foundation of Namibia |
| CSLF | Connecticut Student Loan Foundation |
| CTDF | Community Thanksgiving Dinner Foundation |
| CTDF | Concerned Taxi Drivers Foundation |
| CTDF | Curacao Tourism Development Foundation |
| CTEF | Career Technical Education Foundation |
| CTEF | Ceramic Tile Education Foundation |
| CTEF | China Tomorrow Education Foundation |
| CTF | Career and Technology Foundations |
| CTF | Children's Tumor Foundation |
| CTFA | Children's Theatre Foundation of America |
| CTFL | Certified Tester Foundation Level |
| CTFM | Computability Theory and Foundations of Mathematics |