| Konzentrationslager | concentration camp |
| Konzentration | concentration |
| Kondensationsflasche | Leyden jar |
| Konfessionsloser | nonsectarian |
| Kontaktjonglage | contact juggling |
| Konvektionsregen | convectional rainfall |
| Präsentationslogik | presentation logic |
| Kommunikationsdaten | communication |
| Kompensationshandel | countertrade |
| Kombinationszange | combination pliers engineers pliers |
| Munitionslager | magazine |
| Kondensation | condensation |
| Konsekration | dedication |
| Konventionen | decorum |
| Konzertflügel | concert grand |
| Konzertina | concertina |
| Konzertmeister | concertmaster |
| Konzelebration | concelebration |
| Konzentrat | concentrate |
| Konzertreise | concert tour |