Funders
- CalNonprofits
- Calouste Gulbenkian Foundation
- Campaign for Black Male Achievement
- Campaign for College Opportunity
- Campaign for Grade-Level Reading
- Campion Foundation
- Cancer Research UK
- cand
- Candid
- Capacity Building Hub
- Capital One
- Capital One Foundation
- Capitol Corridor Joint Powers Authority
- Care Collaborative
- Care for All with Respect and Equity (CARE) Fund
- CARE Germany
- CARE USA
- CareFirst BlueCross BlueShield
- CareSource
- CARESTAR Foundation
- Cargill Foundation
- Carilion Foundation
- Caring for Colorado Foundation
- Caring Place, City of Portage
- Carnegie Corporation of New York
- Carnegie Foundation for the Advancement of Teaching
- Carnegie UK Trust
- Carolan K. Stiles
- Carsey Institute's Endowment
- Carsey School of Public Policy at The University of New Hampshire