| Konsulat | consulate |
| Konsul | consul |
| Konsole | console |
| Konsonant | consonant |
| Konspekt | summary |
| Konsum | consumption |
| Konsument | consumer |
| Konsumgut | final good |
| Konvolut | envelope |
| konjugal | conjugal |
| konstant | constant constantly |
| Kopula | copula |
| Postulat | postulation postulate axiom posit |
| Kohlsalat | coleslaw |
| Kopfsalat | lettuce butterhead lettuce |
| Korrelat | dummy element |
| Ikonoklast | iconoclast |
| Kondylom | genital wart |
| Konfekt | candy |
| Konfutse | Confucius |