| Kondukteur | bus conductor |
| Konduktion | conduction |
| Konjektur | conjecture |
| Konjunktur | economic situation boom |
| Konstrukteur | designer constructer constructor |
| Konautor | coauthor |
| Konditor | confectioner |
| Konter | counter-attack |
| Kontraktur | contracture |
| Kontur | contour outline |
| Induktor | inductor |
| Redakteur | editor |
| Kolporteur | colporter colporteur |
| Kondiment | condiment |
| Konfekt | candy |
| Konfucius | Confucius |
| Konfutse | Confucius |
| Konfuzius | Confucius |
| Konsumtion | consumption |
| Kontaktzaun | electric fence |