| Co |
| CO2 |
| coast to coast |
| COB/C.O.B |
| Coby |
| CoC |
| CoC, Cläsäri |
| coca |
| Coca Cola |
| Cocaanium |
| cocacolaistuminen |
| cocacolasääret |
| cocis |
| coldis |
| Coldmail |
| collikka |
| Collo |
| Colt |
| coltti |
| comeback |
| commando |
| Como estas extasius |
| Comppis |
| Conan |
| concorde |
| conffia (engl. configure) |
| Coni |
| Connarit |
| Connectionlagi |
| conssi |
| Continental |
| Conu |
| Cookie monster |
| cool |
| Coolest monkey in the jungle |
| coop |
| Copacabana |
| COPD |
| Cope |