| Konvolut | envelope |
| Konvent | convent |
| Konsole | console |
| Konsulat | consulate |
| Konvoi | convoy |
| konfluent | confluent |
| Kouvola | Kouvola |
| Kondylom | genital wart |
| Konfekt | candy |
| Konoid | conoid |
| Kontobuch | account book |
| Kontor | office |
| Kontrakt | compact contract |
| Konvertit | convert |
| konfus | confused |
| Kondolenz | condolence |
| Kondom | condom rubber |
| Kondor | condor |
| Konflikt | conflict clash |
| Konfluenz | confluence |