| Kabelbinder | EQT | -tie-wrap | - | - | - | |
| Kabelfernsehen | -cable TV | - | - | - | ||
| Kabine | -cabin | - | - | - | ||
| Kaiserfisch | BIO/ZOO | -angelfish | - | - | - | |
| Kaninchenfisch | BIO/ZOO | -rabbitfish | - | - | - | |
| Kardinalfisch | BIO/ZOO | -cardinalfish | - | - | - | |
| Karpfen (m) | BIO/ZOO | -carp | - | - | - | |
| Karrettschildkröte | BIO/ZOO | -loggerhead turtle | - | - | - | |
| Kaschierung | EQT | -lining | - | - | - | |
| Katalog | -catalogue | - | - | - | ||
| Katzenhai | BIO/ZOO | -dogfish -bamboo shark |
- | - | - | |
| Kegelschnecke | BIO/ZOO | -cone shell | - | - | - | |
| Keilriemen | EQT | -V-belt | - | - | - | |
| Kellner | -waiter | - | - | - | ||
| Kieferfisch | BIO/ZOO | -jawfish | - | - | - | |
| Kiemendeckel | BIO/ZOO | -operculum | - | - | - | |
| Kiemenspalte | BIO/ZOO | -gill slit | - | - | - | |
| Kieselstein | -shingle | - | - | - | ||
| Kilometerbegrenzung | -speed limit | - | - | - | ||
| Kinderanimateur | -children's entertainer | - | - | - | ||
| Kinderanimation | -children's entertainment | - | - | - | ||
| Kinderausweis | -child I.D. | - | - | - | ||
| Kinderbecken | -children's pool | - | - | - | ||
| Kinderbereich | -children's area | - | - | - | ||
| Kinderbetreuung | -childcare | - | - | - | ||
| Kinderermäßigung | -children's discount | - | - | - | ||
| kinderfreundlich | -child-friendly | - | - | - | ||
| Kindergarten | -kindergarten | - | - | - | ||
| Kindergärtnerin | -kindergarten teacher | - | - | - | ||
| Kinderhochstuhl | -(child's) high chair | - | - | - | ||
| Kinderportion | -children's portion | - | - | - | ||
| Kindersitz | -child's seat | - | - | - | ||
| Kinderspielplatz | -(children's) playground | - | - | - | ||
| Kindertarif | -children's rate | - | - | - | ||
| kindgerecht | -suitable for children | - | - | - | ||
| Klasse | -class | - | - | - | ||
| Kleingedrucktes | -small print | - | - | - | ||
| kleinvolumig | EQT | -low profile | - | - | - | |
| kleinvolumige Maske | EQT | -lower profile mask | - | - | - | |
| Klettverschluss | EQT | -velcro closure | - | - | - | |
| Klimaanlage | -air-conditioning | - | - | - | ||
| Klinge | EQT | -blade | - | - | - | |
| Kniepolster | EQT | -knee pad | - | - | - | |
| Knochenfisch | BIO/ZOO | -bony fish | - | - | - | |
| Knorpelfisch | BIO/ZOO | -cartilaginous fish | - | - | - | |
| Knoten | EQT | -knot | - | - | - | |
| Kofferfisch | BIO/ZOO | -trunkfish | - | - | - | |
| Kohlendioxid | -carbon dioxide | - | - | - | ||
| Kolben | EQT | -piston | - | - | - | |
| kolbengetrieben | EQT | -piston-operated | - | - | - | |
| Kombüse | -galley | - | - | - | ||
| Kompass | EQT | -compass | - | - | - | |
| Kompassnadel | EQT | -compass needle | - | - | - | |
| Kompression | -compression | - | - | - | ||
| Kompressor (m) | EQT | -compressor | - | - | - | |
| Kompressorblock | EQT | -compressor block | - | - | - | |
| komprimiertes Neopren (n) Crash Neopren |
EQT | -crushed neoprene | - | - | - | |
| Konsole | EQT | -console | - | - | - | |
| Kontaktadresse | -contact address | - | - | - | ||
| kontaktieren | -contact | - | - | - | ||
| Kontaktlinse | -contact lense | - | - | - | ||
| Konto | -account | - | - | - | ||
| Kontoauszug | -account statement | - | - | - | ||
| Kontodeckung | -sufficient funds | - | - | - | ||
| Kontonummer | -account number | - | - | - | ||
| Kontostand | -account balance | - | - | - | ||
| Kontrast | -contrast | - | - | - | ||
| kontrolliert schwimmender Notaufstieg (CESA) | -Controlled Emergency Swimming Ascent (CESA) | - | - | - | ||
| kontrolliert sitzender Einstieg | -controlled seated entry | - | - | - | ||
| konzentrischer Domeport | EQT | -concentric dome port | - | - | - | |
| Kopfhaube | EQT | -hood | - | - | - | |
| Kopfschmerzen | MED/ANAT | -headache | - | - | - | |
| Koralle | BIO/ZOO | -coral | - | - | - | |
| Kormoran | BIO/ZOO | -cormorant | - | - | - | |
| Körnung | -grain | - | - | - | ||
| Körperflüssigkeit | MED/ANAT | -body fluid | - | - | - | |
| Körpermasse | MED/ANAT | -body mass | - | - | - | |
| kostenfrei | -free of charge | - | - | - | ||
| kostengünstig | -affordable | - | - | - | - | |
| kostenlos | -free of charge | - | - | - | - | |
| kostenpflichtig | -fee charged | - | - | - | - | |
| kotrastfärbung | -countershading | - | - | - | - | |
| Krabbenspinne | BIO/ZOO | -spider crab | - | - | - | - |
| Kralle | BIO/ZOO | -talon | - | - | - | - |
| Krankenhaus | MED/ANAT | -hospital | - | - | - | - |
| Krankenkasse | MED/ANAT | -health coverage | - | - | - | - |
| Krankenversicherung | MED/ANAT | -health insurance | - | - | - | - |
| krankenversicherungspflicht | MED/ANAT | -compulsory health insurance | - | - | - | - |
| Krawattenzwang | -no-tie rule | - | - | - | - | |
| Kreditkarte | -credit card | - | - | - | - | |
| Kreditkartentelefon | -credit-card phone | - | - | - | - | |
| Kreislauf | MED/ANAT | -circulation | - | - | - | - |
| Kreislaufschwäche | MED/ANAT | -weak circulation | - | - | - | - |
| Krokodilsfisch | BIO/ZOO | -crocodilefish | - | - | - | - |
| Krötenfisch | BIO/ZOO | -frog fish | - | - | - | - |
| Kugelfisch | BIO/ZOO | -puffer | - | - | - | - |
| Küken | -chick | - | - | - | - | |
| Kummerbund | EQT | -cummerbund | - | - | - | - |
| künstliches Licht | -artificial light | - | - | - | - | |
| künstliches Riff | -artificial reef | - | - | - | - | |
| Kurzaufenthalt | -short-term stay | - | - | - | - | |
| Kurzsichtigkeit | MED/ANAT | -nearsightedness | - | - | - | - |