China 
Africa 
- Cacodylic acid
- Cadence
- Cadherin
- Cadherin-1
- Cadinene
- Cadmium
- Cadmium chloride
- Cadmium fluoride
- Cadmium hydroxide
- Cadmium poisoning
- Cadmium selenide
- Cadmium sulfide
- Cadmium telluride
- Cadmium yellow
- Caenorhabditis elegans
- Caesar cipher
- Caesium
- Caesium bromide
- Caesium chloride
- Caesium-137
- Cafestol
- Caffeic acid
- Caffeic acid phenethyl ester
- Caffeine
- CagA
- Cage effect
- Cages
- Cairo
- Caissons
- CakePHP
- Caking
- Calamine
- Calaverite
- Calc-alkaline
- Calc-silicate
- Calc-silicate rock
- Calcaneal fracture
- Calcaneocuboid joint
- Calcaneofibular ligament
- Calcaneus
- Calcarenite
- Calcareous
- Calcific tendinitis
- Calcilutite
- Calcination
- Calcipotriol
- Calcisiltite
- Calcite
- Calcitonin
- Calcitonin receptor
- Calcium
- Calcium Chromate
- Calcium acetate
- Calcium alginate
- Calcium aluminate
- Calcium aluminate cement
- Calcium aluminates
- Calcium aluminoferrite
- Calcium aluminosilicate
- Calcium arsenate
- Calcium bicarbonate
- Calcium borate
- Calcium carbide
- Calcium carbonate
- Calcium channel blockers
- Calcium channels
- Calcium chlorate
- Calcium chloride
- Calcium citrate
- Calcium cyanamide
- Calcium deficiency
- Calcium disilicide
- Calcium fluoride
- Calcium gluconate
- Calcium hydride
- Calcium hydroxide
- Calcium hypochlorite
- Calcium iodide
- Calcium lactate
- Calcium looping
- Calcium magnesium acetate
- Calcium metabolism
- Calcium nitrate
- Calcium nitride
- Calcium nitrite
- Calcium oxalate
- Calcium oxide
- Calcium peroxide
- Calcium phosphate
- Calcium phosphide
- Calcium propionate
- Calcium pumps
- Calcium pyrophosphate
- Calcium signaling
- Calcium silicate
- Calcium silicate hydrate
- Calcium silicide
- Calcium stearate
- Calcium sulfate
- Calcium sulfite
- Calcium titanate
- Calcium-48
- Calcium-binding proteins
- Calcium-sensing receptor
- Calculator
- Calculi
- Calculus
- Calculus of variations
- Calderas
- Calendar
- Calendar year
- Calender
- Calendering
- Calf
- Calf muscle
- Caliber
- Calibration
- Calibration curve
- Calibration gas
- Calibre
- Caliche
- Calicheamicin
- Caliciviridae
- California Gold Rush
- Californium
- Caliper
- Calipers
- Calixarene
- Call admission control
- Call by name
- Call setup
- Call site
- Call stack
- Calling conventions
- Calm technology
- Calmodulin
- Calo
- Caloric theory
- Calories
- Calorific value
- Calorimeters
- Calorimetry
- Calreticulin
- Caltech Intermediate Form
- Calutrons
- Calvaria
- Calvin cycle
- Cam follower
- Camber
- Camber angle