| Abbreviation | Definition |
|---|---|
| CICF | Cincinnati Incorporated Charitable Foundation |
| CICF | Cruise Industry Charitable Foundation |
| CIIRD | Community Initiative for Integrated Rural Development. |
| CLAT | Charitable Lead Annuity Trust |
| CLAT | Charitable Lead Annuity Trusts |
| CMCA | Children's Medical Charities Association |
| CMCF | Claude Moore Charitable Foundation |
| CMCT | Christian Missions Charitable Trust |
| CMOW | Caledon Meals On Wheels |
| CNPC | Chinese National People's Congress |
| CO | Charity Organization |
| COAF | Charities Open Access Fund |
| COAF | Charity Open Access Fund |
| CONFR | Council on Fundraising |
| COTM | Charity of the Month |
| CPCT | Craft Pottery Charitable Trust |
| CPEF | Charity Projects Entertainment Fund |
| CRAT | Charitable Remainder Annuity Trust |
| CRIN | Charities Responsible Investment Network |
| CROC | Citizens Reunited To Overcome Charity |