| Abbreviation | Definition |
|---|---|
| CICI | Centro Internacional De Convivencia Infantil |
| CICOA | Central Indiana Council On Aging |
| CICRFC | Catastrophic Illness in Children Relief Fund Commission |
| CICS | Center for International Co-operation and Security |
| CICS | Centre for Immigrant and Community Services |
| CID | Central Institute for the Deaf |
| CIDA | Community and Individual Development Association |
| CIDA | Council for Interior Design Accreditation |
| CIDCO | Centre interdisciplinaire de développement en cartographie des océans |
| CIDR | Center for Inherited Disease Research |
| CIDRA | Chicago International Dispute Resolution Association |
| CIEH | Center for Indoor Environments and Health |
| CIEH | Chartered Institute of Environmental Health |
| CIEH | Community Initiative to End Homelessness |
| CIEL | Center for International Environmental Law |
| CIF | Chinmaya International Foundation |
| CIFAS | Credit Industry Fraud Avoidance System |
| CiG | City Information Group |
| CII | Children's Institute International |
| CII | Compassion International Incorporated |