| Konzelebration | concelebration |
| Konzentration | concentration |
| Konsekration | dedication |
| Konföderation | confederation |
| Konziliation | reconciliation settlement |
| Kondensation | condensation |
| Konkatenation | concatenation |
| Konspiration | conspiracy |
| Konsultation | consultation |
| Konurbation | conurbation |
| Konfiguration | configuration |
| Konstellation | constellation |
| Kontemplation | contemplation |
| Konversation | conversation |
| Konzeption | conception |
| Kollaboration | collaboration |
| Kommemoration | commemoration |
| Kooperation | cooperation co-operation |
| Korrelation | correlation association |
| Konkretion | concretion |