| Klingon | Klingon language |
| klinik | clinic |
| Klinisk farmaci | Clinical pharmacy |
| klinisk psykologi | clinical psychology |
| klinisk symptom | clinical symptom |
| klint | cliff |
| klipfisk | salt cod |
| Klippans kommun | Klippan Municipality |
| Klippe | Rock |
| Klippe af | Slash |
| Klippeblok | Rock |
| klippedue | rock dove |
| Klippehoppere | Picathartes |
| Klippekirkerne i Lalibela | Lalibela |
| klisterbånd | Scotch tape |
| klit | dune |
| Klit-Rose | Rosa pimpinellifolia |
| klitoris | clitoris |
| Klitorisme | Clitorism |
| Klitperlemorsommerfugl | Number |
| KLM | KLM |
| klo | claw |
| Kloakdyr | Monotreme |
| Klods | Cluster |
| klog | clever |
| Klokke-Lyng | Erica tetralix |
| Klokke-ordenen | Campanulales |
| Klokkeblomst | Tinker Bell |
| Klokkeblomst-familien | Campanulaceae |
| Klokkebusk | Weigela |
| Klokkefrø | European Fire-bellied Toad |
| klokken | time |
| klokker | bell ringer |
| Klokkeren fra Notre Dame | The Hunchback of Notre Dame |
| kloning | cloning |
| klor | chlorine |
| klorerede hydrocarboner | chlorinated hydrocarbon |
| klorfenoler | chlorophenol |
| klorid | chloride |
| kloring | chlorination |
| Kloroform | Chloroform |
| klorofyl | chlorophyll |
| klorose | chlorosis |
| Klorprotixen | Chlorprothixene |
| Kloster | Monastery |
| Klosterkirken Saint-Denis | Basilique Saint-Denis |
| Klosterstyre | Cloistered rule |
| Klotho | Clotho |
| klovn | clown |
| Klovnen Buggy | Buggy the Clown |
| klub | club |
| klud | rag |
| Klunketiden | Victorian era |
| Klymene | Clymene |
| Klyngecomputer | Computer cluster |
| Klynger | Rubus |
| Klytaimnestra | Clytemnestra |
| Klæbefrø-familien | Pittosporaceae |
| klæbestrimmel | Scotch tape |
| Klæbu | Klæbu |
| klæde | attire |
| Klæde på | Dress |
| klædebørste | clothes-brush |
| klædeskab | wardrobe |
| klække | brooding |
| kløft | canyon |
| kløftehammer | claw hammer |
| klør | clubs |
| klør es | ace of clubs |
| Kløvedal | Rivendell |
| Kløver | Clover |
| Knabstrupper | Knabstrup |
| knagen | creak |
| Knahrvorn | Neighbour Jones |
| knald | detonation |
| knalde | fuck |
| knaldsyre | fulminic acid |
| Knallert | Motorcycle |
| knaphulsblomst | buttonhole |
| knappenål | pin |
| knarand | gadwall |
| Knarr | Knarr |
| knasende | crispy |
| Knep dig selv | fuck you |
| kneppe | fuck |
| Knesset | Knesset |
| Knetgummi | Kneaded eraser |
| Knipling | Bobbin lace |
| Knipsereje | Alpheidae |
| knirken | creak |
| kniv | knife |
| Knivmuslinger | Ensis |
| Knivskjellodden | Knivskjellodden |
| kno | ankle |
| Knob | Knot |
| knofedt | elbow grease |
| knogle | bone |
| Knoglemarv | Bone marrow |
| knojern | brass knuckles |
| knold | tuber |
| Knold og Tot | The Katzenjammer Kids |
| Knoldbakterie | Root nodule |
| knoldet mjødurt | dropwort |
| Knop-Stenbræk | Saxifraga cernua |
| Knoporm | Turnip Moth |
| Knoppix | Knoppix |
| Knopsvane | Mute Swan |
| Knopurt | Centaurea |
| Knossos | Knossos |
| Knowhow | Procedural knowledge |
| Knud | Canute |
| Knud den Hellige | Canute IV of Denmark |
| Knud den Store | Canute the Great |
| Knud Ejler Løgstrup | Knud Ejler Løgstrup |
| Knud Enemark | Knud Enemark Jensen |
| Knud Lavard | Canute Lavard |
| Knud Rasmussen | Knud Johan Victor Rasmussen |
| knuget | despondent |
| knus | hug |
| Knut | Knut |
| Knut Eriksson af Sverige | Canute I of Sweden |
| Knut Hamsun | Knut Hamsun |
| Knut Holmgersson Lange | Canute II of Sweden |
| Knytte | Knot |
| knyttet til | attached |
| knæ | knee |
| knækbrød | crispbread |
| Knæler | Giant Asian mantis |
| ko | cow |
| Ko og Kylling | Cow and Chicken |
| koagulering | coagulation |
| koala | koala |
| Koalitionen af Villige Lande under Irakkrigen | Multinational force in Iraq |
| Koalitionens civile administration i Irak | Coalition Provisional Authority |
| kobber | copper |
| Kobberalder | Copper Age |
| Kobberopstanden | Copper Riot |
| Kobe | Kobe |
| koben | crowbar |
| Koble af | Second |
| Koblenz | Koblenz |
| kobling | clutch |
| kobolt | cobalt |
| Kobudo | Kobudo |
| Kodachrome | Kodachrome |
| Kodak | Eastman Kodak |
| Kodefri | DVD region code |
| Kodein | Codeine |
| kodeks | code |
| kodenavn | code name |
| kodeord | password |
| kodex | code |
| kodifikation | codification |
| Kodriver-familien | Primulaceae |
| koefficient | coefficient |
| Koffardiflag | Civil ensign |
| koffein | caffeine |
| koffeinfri | decaffeinated |
| Kofi Annan | Kofi Annan |
| kog | polder |
| kogalskab | bovine spongiform encephalopathy |
| kogebog | cookbook |
| kogepunkt | boiling point |
| Kogleaks | Scirpus |
| kognition | cognition |
| Kognitionspsykologi | Cognitive psychology |
| kognitiv | cognitive |
| Kognitiv adfærdsterapi | Cognitive therapy |
| Kognitiv psykologi | Cognitivism |
| kogt æg | boiled egg |
| kohejre | cattle egret |
| Kohkiluyeh og Buyer Ahmad | Kohgiluyeh and Boyer-Ahmad Province |
| Kohtla-Järve | Kohtla-Järve |
| Kohvede | Melampyrum |
| Koichi Tohei | Koichi Tohei |
| Koilesyrien | Coele-Syria |
| Kointegration | Cointegration |
| Koios | Coeus |
| Koji Kondo | Koji Kondo |
| kok | cook |
| kokain | cocaine |
| kokettere | coquet |
| Kokos | Coconut |
| kokosnød | coconut |
| kokospalme | coconut palm |
| koks | coke |
| Kola superdybe borehul | Kola Superdeep Borehole |
| Kolahalvøen | Kola Peninsula |
| Kolchis | Colchis |
| kold | cold |
| kold fusion | cold fusion |
| koldblodig | cold-blooded |
| koldblodighed | sangfroid |
| koldbrand | gangrene |
