| CKC | Cadet Karting Cup 
| Others |
| CKC | California Karate Championships
| Others |
| CKC | Campus Kids Connection
| Others |
| CKC | Canadian Kennel Club
| Others |
| CKC | Canet Kite Club
| Others |
| CKC | Canine Kennel Club
| Others |
| CKC | Canoe Kayak Club
| Others |
| CKC | Canton Kayak Club
| Others |
| CKC | Carolina Karting Championship
| Others |
| CKC | Carolina Kayak Club
| Others |
| CKC | Cary Kopczynski Company
| Others |
| CKC | Cavalier King Charles
| Others |
| CKC | Central Kentucky Chapter
| Others |
| CKC | Chaing Kai C
| Others |
| CKC | Cherkassy, Russia
| Others |
| CKC | China Kettlebell Club
| Others |
| CKC | Choot Ka Chatora
| Others |
| CKC | Christ the King College
| Others |
| CKC | Chrysler K-Car
| Others |
| CKC | CIFEJ Kids Club
| Others |
| CKC | Citrix Knowledge Center
| Others |
| CKC | Citroen Klub Croatia
| Others |
| CKC | Closed Kinetic Chain
| Others |
| CKC | Cold Killer Club
| Others |
| CKC | Colossal Kaiju Combat
| Others |
| CKC | Community Knowledge Centers
| Others |
| CKC | Community knowledge Centre
| Others |
| CKC | Complete Kit Car
| Others |
| CKC | Continental Kennel Club
| Others |
| CKC | Cool Kids Club
| Others |
| CKC | Core Knowledge Category
| Others |
| CKC | Corporate Key Contributors
| Others |
| CKC | Create Kids Couture
| Others |
| CKC | Creating Keepsakes Conventions
| Others |
| CKC | Cultural Knowledge Consortium
| Others |
| CKC | Custom Kar Crafterz
| Others |
| CKC | Custom Kyley Cutlery
| Others |
| CKC | Cyber Kill Chain
| Others |