| Abbreviation | Definition |
|---|---|
| CORS | Company Operated Retail Store |
| COSA | Company of Science and Art |
| COSA | Company of Science Art |
| COSG | China Ocean Shipping Group |
| COSL | Chapman Oulsnam Speirs Ltd |
| COSL | China Oilfield Services Limited |
| COSL | China Oilfield Services Ltd |
| COSL | Citicorp Overseas Software Limited |
| COSL | Citicorp Overseas Software Ltd |
| COSL | Credit Ombudsman Service Ltd |
| COSL | Office Supplies Ltd |
| COSO | Central Operations Services Office |
| COSTCO | China Over Seas Tradding COmpany. |
| COSTCO | Chinesse Offshore Shipping Transportation Company owned |
| COSTCO | Cost Company |
| COTA | Caribbean Organisation of Tax Administrators |
| COTC | Central Oklahoma Telephone Company |
| COTI | Community Outreach Team Inc |
| COTI | Critical Outcome Technologies Inc |
| COTS | Champion Optical Technology Services |