| Konventsmesse | convent mass |
| Konventikel | conventicle |
| Königsmeise | yellow-cheeked tit |
| Konzertreise | concert tour |
| Handelsmesse | trade fair |
| Totenmesse | requiem |
| Knetmasse | plasticine play dough |
| Sonnenmasse | solar mass |
| Konvenienzehe | marriage of convenience |
| Konvent | convent |
| Konventionen | decorum |
| Konvexlinse | convex lens |
| Konzertmeister | concertmaster |
| Kondensmilch | condensed milk evaporated milk dehydrated milk |
| Konsensus | consensus |
| Kontextmenü | context menu |
| Konvention | convention |
| kondensieren | condense precipitate |
| konvenient | convenient |
| konvenieren | be suitable |