| Konjektur | conjecture |
| Konjunktur | economic situation boom |
| Korrektur | correction |
| Konfekt | candy |
| Kondukteur | bus conductor |
| Kontraktur | contracture |
| Kontur | contour outline |
| Kollektor | collector |
| Korrektor | proofreader |
| Kontor | office |
| Konvent | convent |
| Konvertit | convert |
| Konzetti | extended metaphor |
| konjunktiv | conjunctive |
| Konjunktiv | subjunctive conjunctive mood conjunctive conjunctive mode |
| Konautor | coauthor |
| Konditor | confectioner |
| Konfektion | make manufacture ready-to-wear off-the-peg clothing off-the-rack clothing clothing industry |
| Konfetti | confetti |
| Konfitüre | jam confiture |