| Abbreviation | Definition |
|---|---|
| CIJA | Centre for Israel and Jewish Affairs |
| CIKARD | Center for Indigenous Knowledge for Agriculture and Rural Development |
| CIMC | Cleanups In My Community |
| CIMMYT | Centro Internacional de Mejoramiento de Maíz y Trigo (in Spanish) International Maize and Wheat Improvement Centre |
| CIMMYT | International Maize and Wheat Improvement Center |
| CIMN | Civilna Iniciativa |
| CIMS | Coalition for Improving Maternity Services |
| CIO | Charitable Incorporated Organisation |
| CIPA | Cornell Institute for Public Affairs |
| CIPFO | Cyberspace and Intellectual Property FOundation |
| CIPMN | Chartered Institute of Personnel Management of Nigeria |
| CIPO | Consejo Ind??gena Popular de Oaxaca |
| CIPO | Consejo Indígena Popular de Oaxaca |
| CIPPIC | Canadian Internet Policy and Public Interest Clinic |
| CiRA | Center for iPS Cell Research and Application |
| CIRF | Cancer Immunology Research Foundation |
| CIRF | Center For Individual Responsibility And Freedom |
| CIRF | Converging Industries Research Foundation |
| CIS | Casualty Information Society |
| CIS | Center for Immigration Studies |