| Abbreviation | Definition |
|---|---|
| CIW | Carnegie Institution of Washington |
| CIWA | Catholic Institute Of West Africa |
| CIWA | Clinical Institute Withdrawal Assessment |
| CIWM | Chartered Institution of Wastes Management |
| CIWS | Cornell Institute for Women in Science |
| CIYA | China Institute Young Associates |
| CJI | Carolina Journalism Institute |
| CJI | Colorado Judicial Institute |
| CJI | Crime and Justice Institute |
| CKI | Charles Koch Institute |
| CLCI | Community Learning Center Institute |
| CLI | Children's Learning Institute |
| CLI | Christian Leadership Institute |
| CLI | Continual Learning Institute |
| CLIE | Certified Large Institution Examiner |
| CLIMB | Christian Leadership Institute of Minnesota and Beyond |
| CLIS | Christian Leadership Institute of Sudan |
| CLISS | Christian Leadership Institute of South Sudan |
| CLLI | Collegiate Livestock Leaders Institute |
| CLRI | Central Leather Research Institute |