- Cohesin
- Cohesion
- Cohort
- Cohort effects
- Cohort studies
- Cohort study
- Coiled coil
- Coilin
- Coinfection
- Coitus interruptus
- Col11a2
- Col1a2
- Col3a1
- Col4a2
- Col4a4
- Col4a6
- Col5a2
- Col6a2
- Col6a3
- Col9a2
- Col9a3
- Colanic acid
- Colcemid
- Colchicine
- Colchicum
- Colchicum autumnale
- Cold
- Cold abscess
- Cold agglutinin
- Cold agglutinin disease
- Cold chain
- Cold chills
- Cold compress
- Cold injury
- Cold ischemia
- Cold nodule
- Cold plasma
- Cold pressor test
- Cold sensitivity
- Cold shock response
- Cold sores
- Cold stress
- Cold sweat
- Cold trap
- Cold turkey
- Cold urticaria
- Cole crops
- Cole1
- Colecalciferol
- Colectomy
- Colesevelam
- Colestipol
- Coleus amboinicus
- Coley's toxins
- Colic
- Colicin
- Coliform bacteria
- Coliform bacterium
- Colipase
- Colipases
- Coliphages
- Colistimethate
- Colistin
- Colitis
- Collaborative Care
- Collaborative problem-solving
- Collaborative therapy
- Collagen
- Collagen VI
- Collagen disease
- Collagen diseases
- Collagen fibers
- Collagen fibrils
- Collagen helix
- Collagen induction therapy
- Collagen loss
- Collagen receptor
- Collagen-induced arthritis
- Collagenase
- Collagenase clostridium histolyticum
- Collagenous colitis
- Collateral circulation
- Collateral ventilation
- 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