- Calories
- Calorimeters
- Calorimetry
- Calutrons
- Calvin cycle
- Camber
- Camera
- Camphor
- Cams
- Canal lining
- Canals
- Canard
- Cancer
- Cancer staging
- Candela
- Canning
- Cannons
- Cantilevers
- Capacitance
- Capacitors
- Capillary
- Capillary action
- Capillary electrophoresis
- Capillary number
- Capillary waves
- Capitalism
- Car
- Car seat
- Car suspension
- Carbamate
- Carbanions
- Carbenes
- Carbide
- Carbide-derived carbon
- Carbocations
- Carbohydrates
- Carbon accounting
- Carbon black
- Carbon capture and storage
- Carbon cycle
- Carbon dioxide
- Carbon disulfide
- Carbon fibers
- Carbon footprint
- Carbon group
- Carbon monoxide
- Carbon monoxide dehydrogenase
- Carbon monoxide detectors
- Carbon monoxide poisoning
- Carbon nanocones
- Carbon nanofibers
- Carbon nanotube field-effect transistor
- Carbon nanotubes
- Carbon quantum dots
- Carbon sequestration
- Carbon sinks
- Carbon steel
- Carbon tetrachloride
- Carbon-12
- Carbon-carbon bonds
- Carbon-dioxide laser
- Carbon-fiber-reinforced polymers
- Carbon-fluorine bonds
- Carbon-nitrogen bonds
- Carbonatation
- Carbonate
- Carbonate minerals
- Carbonate rock
- Carbonation
- Carbonatites
- Carbonic acid
- Carbonic anhydrase
- Carbonitriding
- Carbonyl fluoride
- Carbonyl groups
- Carboplatin
- Carboranes
- Carboxylates
- Carboxylic acids
- Carboxypeptidase
- Carburetor
- Carburizing
- Carcinogens
- Cardiac arrest
- Cardiac magnetic resonance imaging
- Cardiomyopathy
- Cardiovascular disease
- Carnallite
- Carnot cycle
- Carotid body
- Carpenters
- Carpet
- Carrara marble
- Carrier scattering
- Carrier wave
- Cartesian coordinate system
- Cartons
- Cascade
- Case-control study
- Case-hardening
- Cassiterite
- Cast iron
- Cast iron pipe
- Cast stone
- Cast-in-place concrete
- Castability
- Casting
- Casting defects
- Castor oil
- Cat's eyes
- Catabolism
- Catalyst support
- Catalysts
- Catalytic converter
- Catalytic reforming
- Cataracts
- Catastrophic failure
- Catenary
- Cathodic
- Cathodic protection
- Cauchy momentum equation
- Cauchy stress tensor
- Caulk
- Cavitation
- Cavity walls
- Cell adhesion
- Cell membrane
- Cell signaling
- Cellular confinement
- Cellular respiration
- Cellulose
- Cellulose acetate
- Cellulose fiber
- Cement
- Cement accelerator
- Cement board
- Cement chemist notation
- Cement clinker
- Cement kiln
- Cement render
- Cementation process
- Cementite
- Cenospheres
- Censoring
- Center of mass
- Centimetres
- Central nervous system
- Centrifugal casting
- Centrifugal fan
- Centrifugal force