- Collectin
- Collecting duct
- Collecting duct carcinoma
- Collecting duct system
- Collective dose
- Collective trauma
- Collective unconscious
- Collenchyma
- Colles fracture
- Colles' fracture
- Collidine
- Colligative property
- Collimation
- Collimator
- Collinearity
- Collis gastroplasty
- Collision theory
- Colloid cyst
- Colloidal gold
- Colloidal silver
- Colloidal solution
- Colloids
- Coloboma
- Colocalization
- Colocasia esculenta
- Colocynth
- Colon
- Colon adenocarcinoma
- Colon cancer
- Colon carcinoma
- Colon perforation
- Colon polyp
- Colon resection
- Colonial morphology
- Colonisation resistance
- Colonoscopy
- Colony forming cell
- Colony forming units
- Colony hybridization
- Colony stimulating factor
- Colony stimulating factor 1
- Colony stimulating factor 1 receptor
- Colony stimulating factor receptor
- Colony-forming units
- Colony-stimulating factor
- Color
- Color blindness
- Color perception
- Color reaction
- Color therapy
- Color vision
- Colorado tick fever
- Colorado tick fever virus
- Colorectal adenoma
- Colorectal cancer
- Colorectal cancer screening
- Colorectal carcinoma
- Colorectal polyps
- Colorimetric analysis
- Colorimetry
- Coloring agents
- Colostomy
- Colostrum
- Colour constancy
- Colour perception
- Colour vision
- Colpocephaly
- Colpocleisis
- Colporrhaphy
- Colposcopy
- Colpotomy
- Columbamine
- Columbia Suicide Severity Rating Scale
- Column chromatography
- Columnar epithelium
- Colwellia
- Colyte
- Coma
- Coma scale
- Comamonadaceae
- Comamonas
- Combat fatigue
- Combat stress reaction
- Combination antibiotic
- Combination chemotherapy
- Combination drug
- Combination product
- Combination reaction
- Combination therapy
- Combination tone
- Combinatorial chemistry
- Combined drug intoxication
- Combined hormonal contraception
- Combined hormonal contraceptive
- Combined hyperlipidemia
- Combined immunodeficiencies
- Combined immunodeficiency
- Combined oral contraceptive pill
- Combined pulmonary fibrosis and emphysema
- Combitube
- Combretastatin
- Combretastatin A-1
- Combretastatin a-4
- Combretastatin a4
- Combretum
- Combustion
- Combustion analysis
- Comedo
- Comedogenic
- Comedown
- Comet assay
- Comfort
- Comfort food
- Commensal
- Commensalism
- Commercial determinants of health
- Comminuted fracture
- Commiphora myrrha
- Commission on Health Research for Development
- Commissures
- Commissurotomy
- Committed dose
- Commodity chemicals
- Common Rule
- Common Technical Document
- Common Terminology Criteria for Adverse Events
- Common ancestry
- Common bile duct
- Common bile duct stone
- Common cardinal veins
- Common carotid artery
- Common cold
- Common disease-common variant
- Common extensor tendon
- Common facial vein
- Common fibular nerve
- Common gamma chain
- Common hepatic artery
- Common hepatic duct
- Common iliac arteries
- Common iliac artery
- Common iliac vein
- Common ingroup identity
- Common interosseous artery
- Common palmar digital arteries
- Common tendinous ring
- Common variable immunodeficiency
- Common-method variance
- Commonly prescribed drugs
- Commotio cordis