| Abbreviation | Definition |
|---|---|
| CK | Calvin Klein |
| CK | Clark Kent |
| CK | Coimbatore Krishnarao Prahalad, Management Professor |
| CK | Commander Katsuragi |
| CK | Cyrus Kurtz |
| CKS | Chaing Kai Shek |
| CL | Catherine Lockhart |
| CL | Chicken Little |
| CLD | Charles Lutwidge Dodgson |
| CM | Charles Mack |
| CM | Charlie Munger |
| CM | Chris Miller |
| CN | Chuck Norris |
| COD | Charles Owen Dexter, botanist |
| Condi | Condoleezza Rice |
| COW | Charlyne Of Wales |
| CP3 | Chris Paul |
| CPBW | Charles Philip Barrington Woollett |
| CPEB | Carl Philipp Emanuel Bach, composer |
| CPH | Chapman Preston Hastie |