| Konzentration | concentration |
| Kondensation | condensation |
| Konsekration | dedication |
| Konzelebration | concelebration |
| Konzentrat | concentrate |
| Konzentrationslager | concentration camp |
| Konspiration | conspiracy |
| Konsultation | consultation |
| Konfiguration | configuration |
| Konfrontation | confrontation |
| Konföderation | confederation |
| Konnotation | connotation |
| Kontemplation | contemplation |
| Kontraktion | contraction |
| Konvention | convention |
| Konversation | conversation |
| Konzeption | conception |
| Konziliation | reconciliation settlement |
| Ozonkonzentration | ozone concentration |
| konzentrieren | concentrate |