| Colorado | Colorado |
| Colorado Avalanche | Colorado Avalanche |
| Colorado Desert | Colorado |
| Colorado River | Colorado River |
| Colorado Rockies | Colorado Rockies |
| Colorectal cancer | Kolorektal cancer |
| colored | farvet |
| colorful | farverig |
| Colossal Cave Adventure | Adventurespil |
| Colossal Squid | Kolosblæksprutte |
| Colosseum | Colosseum |
| Colossus computer | Colossus |
| Colossus of Rhodes | Kolossen på Rhodos |
| colostrum | råmælk |
| colour | farve |
| colour composition | farvesammensætning |
| colour television | farve-tv |
| Colourfast | Lysægthed |
| Colourfastness | Lysægthed |
| colourimetry | kolorimetri |
| coltsfoot | følfod |
| colubrid | snoge |
| Colugos | Kaguanger |
| Columba | Duen |
| Columbia | Columbia |
| Columbia Records | Columbia Records |
| Columbia River | Columbia |
| Columbia University | Columbia University |
| Columbidae | Due |
| Columbiformes | Due |
| columbine | akeleje |
| Columbus | Columbus |
| Columbus Blue Jackets | Columbus Blue Jackets |
| Column of Phocas | Fokas-søjlen |
| Com | COM |
| COM file | COM |
| Coma | Koma |
| Coma Berenices | Berenikes Lokker |
| Comarca | Herredet |
| Comarcas of Spain | Herredet |
| comb | kam |
| combat | slag |
| combative | kamplysten |
| combination | kombination |
| combination effect | kombinationsvirkning |
| Combinatorial mathematics | Kombinatorik |
| combine | kombinere |
| combine harvester | mejetærsker |
| combined cycle-power station | kombineret kraftværk |
| Combined heat and power | Distribueret elproduktion |
| Combined oral contraceptive pill | P-pille |
| combined transport | kombineret transport |
| combined waste water | kombineret spildevand |
| combustibility | brændbarhed |
| combustion | forbrænding |
| combustion engine | forbrændingsmotor |
| combustion gas | forbrændingsgas |
| Combustion point | Antændelsestemperatur |
| combustion residue | forbrændingsrest |
| come | komme |
| come about | ske |
| come across | træffe |
