| kontagiös | contagious |
| Kontagiosität | contagiousness |
| Ontario | Ontario |
| montags | Mondays on Monday |
| Konfucius | Confucius |
| Konfuzius | Confucius |
| Kontor | office |
| Kontorsion | contortion |
| Konautor | coauthor |
| Kondition | condition |
| Konfusion | bewilderment |
| Kongo | Congo Kongo |
| Konkani | Konkani |
| Konnotation | connotation |
| Kontakt | contact |
| Kontaktgift | contact poison |
| Konto | account |
| Kontrabass | double bass double-bass |
| Kontraktion | contraction |
| Königin | queen |