| Abbreviation | Definition |
|---|---|
| CJO | Command Job Officer |
| CK | Career Killer |
| CK | Cat Killer |
| CK | Construction King |
| CKD | Certified Kitchen Designer |
| CKO | Chief Kid Officer |
| CL | Certified Lymphologist |
| CLA | Call Listing Agent |
| CLD | Certified Labor Doula |
| CLEP | Certified Lighting Efficiency Professional |
| CLM | Career Limiting Move |
| CLM | Certified Ladies Man |
| CLMC | Certified Lighting Management Consultant |
| CLMVP | Customer and Channel Development Support Manager |
| CLNC | Certified Legal Nurse Consultant |
| CLO | Chief Logistics Officer |
| CLO | Community Liaison Officer |
| CLO | Coroner's Liaison Officer |
| CLP | Certified Life (insurance) Planner |
| CLP | Certified Logistics Professional |