| Kondensator | capacitor |
| Kondensation | condensation |
| Kondensat | condensate |
| Konservator | conservator |
| Kommentator | commentator |
| Drehkondensator | variable capacitor |
| Konditor | confectioner |
| Konversation | conversation |
| Bodensatz | sediment precipitate dreg lees |
| Kompensation | compensation |
| Ionisator | ioniser ionizer |
| Kolonisator | colonizer |
| Koordinator | coordinator |
| Moderator | moderator host master of ceremonies |
| Kolbenmotor | piston engine |
| Konsekration | dedication |
| Kontor | office |
| Konvent | convent |
| Konautor | coauthor |
| Kondensmilch | condensed milk evaporated milk dehydrated milk |