| Konservendose | can tin |
| Konservenbüchse | tin can |
| Konservator | conservator |
| Konserve | preserve |
| Kondeszendenz | condescension |
| Konservenfabrik | cannery |
| Konvenienzehe | marriage of convenience |
| Konvervative | conservative |
| Konvexlinse | convex lens |
| konkurrenzlos | unrivaled |
| konserviert | canned |
| Konferenz | conference |
| Konsens | consensus consent |
| Konsensus | consensus |
| Konsequenz | consequence |
| Konservativer | conservative |
| Konservierung | conservation preservation mothballing momification |
| Kontroverse | controversy dispute |
| Konvergenz | convergence |
| Konzertreise | concert tour |