| Abbreviation | Definition |
|---|---|
| CISCA | Ceilings and Interior Systems Construction Association |
| CISD | Council of Information Services Directors |
| CISI | Chartered Institute for Securities & Investment |
| CISLA | Cargo Intelligence Security and Logistics Association |
| CISPA | California Internet Service Provider Association |
| CISPR | Comit?? International Sp??cial des Perturbations Radio??lectriques (International Special Committee on Radio Interference) |
| CISPR | Comité International Spécial des Perturbations Radioélectriques (International Special Committee on Radio Interference) |
| CISS | Computer Information Systems Society |
| CIWA | California Insurance Wholesalers Association |
| CIWA | Construction Industries Wholesalers Association |
| CJFE | Canadian Journalists for Free Expression |
| CLA | Canadian Lumbermen's Association |
| CLA | Chiropractic Leadership Alliance |
| CLA | Coin Laundry Association |
| CLAO | Contact Lens Association of Ophthalmologists |
| CLHIGA | California Life and Health Insurance Guarantee Association |
| CLIA | Community Legal Information Association |
| CLIA | Cruise Line Industry Association |
| CLMA | Contact Lens Manufacturers Association |
| CLPA | California Latino Psychological Association |