| Konduktion | conduction |
| Konsumtion | consumption |
| Kondition | condition |
| Konfektion | make manufacture ready-to-wear off-the-peg clothing off-the-rack clothing clothing industry |
| Konjunktion | conjunction |
| Induktion | induction electromagnetic induction mathematical induction |
| Koedukation | coeducation |
| Obduktion | autopsy postmortem post mortem postmortem examination |
| Konkretion | concretion |
| Kondukteur | bus conductor |
| Konfusion | bewilderment |
| Konjugation | conjugation |
| Konkussion | concussion |
| Konstruktion | construction |
| Konsumption | merger consumption |
| Kontraktion | contraction |
| Konvention | convention |
| Konvokation | convocation |
| Konvulsion | convulsion |
| Konzeption | conception |