| Acronym | Definition |
|---|
| CCSI | Canon Computer Systems, Inc. |
| CCSI | Cisco Certified Systems Instructor (training qualification) |
| CCSI | Checkpoint Certified Security Instructor |
| CCSI | Computer & Control Solutions, Inc |
| CCSI | Certified Crime Scene Investigator (International Association for Identification) |
| CCSI | Contact Center Satisfaction Index |
| CCSI | Citicorp Credit Services, Inc. (Citibank) |
| CCSI | Center for Comprehensive School Improvement (McGraw-Hill Companies) |
| CCSI | Creative Computing Solutions Inc (Rockville, MD) |
| CCSI | Commission for Social Care Inspection (UK) |
| CCSI | Canadian Centre for Swine Improvement |
| CCSI | Company Core Safety Information |
| CCSI | Child Care Spaces Initiative (British Columbia Assembly of First Nations; Canada) |
| CCSI | Contemporary Control Systems, Inc |
| CCSI | Channel Coding with Side Information |
| CCSI | Consortium for Computational Signal Interpretation |
| CCSI | Climate Change Science Initiative |
| CCSI | Coordinating Council for School Improvement |
| CCSI | Custom Cable Solutions Inc. (Salisbury, MD) |
| CCSI | Crown Collectors Society International (Fairfax, VA bottle cap collectors club) |