| Abbreviation | Definition |
|---|---|
| CRITI | Caribbean Regional Information and Translation Institute |
| CRPI | Constituent Research Programme Institute |
| CRSI | Concrete Reinforcing Steel Institute |
| CRSI | Crsiconcrete Reinforcing Steel Institute |
| CRTI | Clinical Research Training Institute |
| CSBI | Chicago Summer Business Institute |
| CSBI | Coalition of State Bioscience Institutes |
| CSBI | Coalition of State Biosciences Institutes |
| CSDI | Civil Service Development Institute |
| CSDI | Community Self Determination Institute |
| CSI | Cape Sailing Institute |
| CSI | Committee Of Suansation Institution |
| CSIA | Chimney Safety Institute of America |
| CSIA | Customer Service Institute of America |
| CSIG | Cognitive Systems Institute Group |
| CSIG | Cyberinfrastructure Summer Institute for Geoscientists |
| CSLI | Canadian as a Second Language Institute |
| CSLI | Centre Summer Language Institute |
| CSLI | Colorado Springs Leadership Institute |
| CSPI | Charter School Policy Institute |