| COSI | Center Of Science And Industry 
| Others |
| COSI | Centre for Opera Studies in Italy
| Others |
| COSI | Centre For Organic Seed Information
| Others |
| COSI | Childhood Obesity Surveillance Initiative
| Others |
| COSI | Clarkson Open Source Institute
| Others |
| COSI | Client Oriented Scale of Improvement
| Others |
| COSI | CloseOut System Installation
| Others |
| COSI | Cloud Oriented Subgraph Identification
| Others |
| COSI | Colorado Opportunity Scholarship Initiative
| Others |
| COSI | Columbus Ohio Science Institute
| Others |
| COSI | Comfortable Open Sensible and individual
| Others |
| COSI | Community Of Special Interests
| Others |
| COSI | Community Organizing Student Intern
| Others |
| COSI | Computational Optical Sensing and Imaging
| Others |
| COSI | Conversations On Social Issues
| Others |
| COSI | Copenhagen Stock Exchange International
| Others |
| COSI | Cost Of Savings Index
| Others |
| COSI | Cost Of Supplemental Information
| Others |
| COSI | Creative Outsourcing Solutions International
| Others |