| Konzertina | concertina |
| Konvertit | convert |
| Konzetti | extended metaphor |
| Konzeption | conception |
| Konzern | group combine concern trust |
| Konzert | concert |
| Konzertsaal | concert hall |
| konzertiert | concerted |
| Konterbier | hair of the dog |
| Konzertierung | conciliation |
| Konfektion | make manufacture ready-to-wear off-the-peg clothing off-the-rack clothing clothing industry |
| Konferenz | conference |
| Konfetti | confetti |
| Konsortium | consortium |
| Konvention | convention |
| Konvergenz | convergence |
| Konversion | conversion |
| Konzentrat | concentrate |
| Konzept | draft concept conception |
| Konzerthaus | concert hall concert house |