| Abbreviation | Definition |
|---|---|
| CNSD | Certified Nutrition Support Dietitian |
| CO | Certified Operator |
| CO | Certified Orthotist |
| CO | Corrections Officer |
| CO | Crematory Operator |
| CO | Customization Operator |
| COA | Certified Ophthalmic Assistant |
| COB | Chief Of the Boat |
| COBC | Coordination Of Benefits Contractor |
| CO-D | Co-Defendant |
| COE | Chief Of Engineers |
| COE | Chief Operation Executive |
| CO-I | Co-Investigator |
| COMT | Certified Opthalmic Medical Technician |
| CONS | Consultant |
| COO | Chief Operation Officer |
| COO | Chief Operative Officer |
| COO | hief Operating Officer |
| COOL | Career Options On Line |
| COOL | Construction Opportunities On Line |