| Abbreviation | Definition |
|---|---|
| CGIAR | Consultative Group on International Agriculture Research |
| CGIL | Centre for Genetic Improvement of Livestock |
| CGMS | Crop Growth Monitoring System |
| CH | Cropper Hopper |
| CHARM | Cordillera Highland Agricultural Resource Management |
| CHU | Crop Heat Unit |
| CIAE | Central Institute of Agricultural Engineering |
| CIAR | Centre d'interprétation de l'agriculture et de la ruralité |
| CIAS | Center for Integrated Agricultural Systems |
| CIDA | Cornell Initiative for Digital Agriculture |
| CIDA | Cornell Institute for Digital Agriculture |
| CIFAN | Center for Nyeleni Farmers' Agroecology |
| CIFAR | California Institute of Food and Agricultural Research |
| CIMMYT | Centro Internacional de Mejoramiento de Maíz Y Trigo |
| CIMMYT | Centro Internacional de Mejoramiento de Maíz y Trigo (in Spanish) International Maize and Wheat Improvement Centre |
| CIMMYT | Centro Internacional de Mejoramiento de Maíz y Trigo (International Maize and Wheat Improvement Centre) |
| CINAC | Chronic Interstitial Nephritis In Agricultural Communities |
| CINAC | Chronic Interstitial Nephritis of Agricultural Communities |
| CIOA | Carrot Improvement for Organic Agriculture |
| CIRB | Crop Insurance Research Bureau |