| Konvention | convention |
| Konventionen | decorum |
| konventionell | conventional |
| Konfektion | make manufacture ready-to-wear off-the-peg clothing off-the-rack clothing clothing industry |
| Konversion | conversion |
| Konzeption | conception |
| Invention | invention |
| Kondensation | condensation |
| Konduktion | conduction |
| Konkretion | concretion |
| Konsumtion | consumption |
| Konvent | convent |
| Konventikel | conventicle |
| Konvertit | convert |
| Kondition | condition |
| Konfession | denomination |
| Konjunktion | conjunction |
| Konversation | conversation |
| Konvokation | convocation |
| Konvulsion | convulsion |