| Abbreviation | Definition |
|---|---|
| CTLI | Complete Tennessee Leadership Institute |
| CTMI | Chagpori Tibetan Medical Institute |
| CTNI | Clinical Trials Network Institute |
| CTRI | California Tomato Research Institute |
| CTRI | Central Tobacco Research Institute |
| CTRI | Clinical and Translational Research Institute |
| CTRI | Clinical Translational Research Institute |
| CTSI | California Traffic Safety Institute |
| CTSI | Chartered Trading Standards Institute |
| CTSI | Clinical and Translational Science Institute |
| CTSI | Clinical and Translational Sciences Institute |
| CTSI | Clinical Translational Science Institute |
| CTTI | Chalcedon Teacher Training Institute |
| CTTI | Chicago Transformation Teacher Institutes |
| CUCI | Carpet and Upholstery Cleaning Institute |
| CULI | Chulalongkorn University Language Institute |
| CVAI | Canada Vocal Arts Institute |
| CVAI | Canadian Vocal Arts Institute |
| CVAI | Coachella Valley Arts Institute |
| CVCI | Chula Vista College Institute |