| CCTN | Canadian Clinical Trial Network 
| Others |
| CCTN | Cardiovascular Clinical Trials Network
| Others |
| CCTN | Catholic Community Television Network
| Others |
| CCTN | Cebu Catholic Television Network
| Others |
| CCTN | Center for Clinical Trials Network
| Others |
| CCTN | Certified Clinical Transplant Nurse
| Others |
| CCTN | Clear Channel Traffic Network (Clear Channel Albany; New York)
| Others |
| CCTN | Commissione Consultiva Tossicologica Nazionale (Italian: National Toxicology Advisory Commission)
| Others |
| CCTN | Contraceptive Clinical Trials Network
| Others |
| CCTN | Coronary Care-Trained Nurse
| Others |