| Kalmengürtel | doldrums |
| Kuipergürtel | Kuiper belt |
| Samenmantel | aril |
| Armenviertel | poor district poor quarter |
| Blumengarten | flower garden |
| Korallengarten | coral garden |
| Küchengarten | kitchen garden |
| Grüngürtel | green belt |
| Haltegurt | tether |
| Hauptgürtel | asteroid belt |
| Kuiper-Gürtel | Kuiper belt |
| Ledergürtel | leather belt |
| Kleingarten | allotment |
| Kassenzettel | sales slip receipt |
| Klientel | clientele |
| Kalenden | calends |
| Kalette | culet |
| Kalkerde | quicklime |
| Kaltnadel | drypoint |
| kalter Krieg | cold war |
| Kalter Krieg | Cold War |