| Abbreviation | Definition |
|---|---|
| CMLI | Cardinal Martini Leadership Institute |
| CMLI | Chartered membership of the Landscape Institute |
| CMPI | City of Malabon Polytechnic Institute |
| CMRI | Calcutta Medical Research Institute |
| CMRI | Central Mining Research Institute |
| CMRI | Children's Medical Research Institute |
| CMSI | Center for Minority Serving Institutions |
| CMSI | China Maritime Studies Institute |
| CMSI | Coastal and Marine Sciences Institute |
| CMSI | Coastal Marine Sciences Institute |
| CMTI | Case Management Training Institute |
| CMTI | Chesapeake Marine Training Institute |
| CNCI | Canadian Nursery Certification Institute |
| CNCI | Chittaranjan National Cancer Institute |
| CNDI | Cal National Debate Institute |
| CNI | Coastal Neurological Institute |
| CNI | Colorado Neurological Institute |
| CNICP | China National Institute of Cultural Property |
| CNP | Civilian Noninstitutional Population |
| CNSI | Caribbean Netherlands Science Institute |