| Konkatenation | concatenation |
| Kontamination | amalgam blending |
| Kondensation | condensation |
| Konkretion | concretion |
| Konfabulation | confabulation |
| Konföderation | confederation |
| Kongratulation | congratulation |
| Konnotation | connotation |
| Konstellation | constellation |
| Konvention | convention |
| konkatenieren | concatenate |
| Inkarnation | incarnation |
| Konsekration | dedication |
| Konspiration | conspiracy |
| Konsultation | consultation |
| Kontrazeption | contraception |
| Konurbation | conurbation |
| konkave Funktion | concave function |
| Dekontamination | decontamination |
| Konfektion | make manufacture ready-to-wear off-the-peg clothing off-the-rack clothing clothing industry |