| Acronym | Definition |
|---|
| CK | Calvin Klein |
| CK | Check |
| CK | Creek |
| CK | Circuit |
| CK | Creatine Kinase (blood test) |
| CK | Circle K (Community Service Group) |
| CK | Cook Islands (country code, top level domain) |
| CK | Cocos (Kneeling) Islands |
| CK | Common Knowledge |
| CK | Chatham-Kent (Canada) |
| CK | Conductive Keratoplasty |
| CK | Conversion Kit |
| CK | Clark Kent (Superman) |
| CK | Cask |
| CK | Captain Kidd |
| CK | Citizen Kane (Orson Welles movie) |
| CK | Chuck Klosterman (writer) |
| CK | Cop Killer |
| CK | Casein Kinase (enzyme) |
| CK | Cyanogen Chloride |
| CK | Carnal Knowledge |
| CK | Clockwork Knight (video game) |
| CK | Carbon Kevlar (composite fabric) |
| CK | Corner Kick (soccer) |
| CK | Cricket Kenya |
| CK | Caramello Koala (Cadbury chocolate) |
| CK | Commander Keen |
| CK | Chris Kirkpatrick (NSYNC member) |
| CK | Confirmed Kills |
| CK | Cement Kiln |
| CK | Center Keep (gaming) |
| CK | Crip Killer (gangs) |
| CK | Containerized Kitchen |
| CK | Chicken Katsu |
| CK | Chidamber and Kemerer (metrics suite) |
| CK | Centralni Komite |
| CK | Cyto Keratin (immunohistochemistry) |
| CK | Compartment Key |