China 
Africa 
- Charge-transfer complexes
- Charged particle beams
- Charged particles
- Charged-Device Model
- Charging station
- Charlson Comorbidity Index
- Charnockite
- Charpy impact test
- Charrette
- Charring
- Chart datum
- Chart patterns
- Chassis
- Chatbots
- Chatter marks
- Chauvenet's criterion
- Chavicol
- Cheap talk
- Chebyshev distance
- Chebyshev filter
- Chebyshev nodes
- Chebyshev polynomials
- Chebyshev pseudospectral method
- Chebyshev's inequality
- Check dams
- Check sheet
- Check valves
- Checklists
- Checkpoint inhibitors
- Checksum
- Cheek
- Cheese ripening
- Cheilitis
- Chelate
- Chelating resins
- Chelation
- Chelation therapy
- Chelex 100
- Chemical
- Chemical accidents
- Chemical affinity
- Chemical bath deposition
- Chemical biology
- Chemical bonds
- Chemical burns
- Chemical change
- Chemical chaperones
- Chemical composition
- Chemical compounds
- Chemical databases
- Chemical decomposition
- Chemical defense
- Chemical element
- Chemical energy
- Chemical engineer
- Chemical engineering
- Chemical equation
- Chemical equilibrium
- Chemical finishing
- Chemical formula
- Chemical hazards
- Chemical imaging
- Chemical ionization
- Chemical kinetics
- Chemical laser
- Chemical ligation
- Chemical looping combustion
- Chemical metallurgy
- Chemical milling
- Chemical modification
- Chemical oscillator
- Chemical phosphorus removal
- Chemical plants
- Chemical polarity
- Chemical potential
- Chemical process
- Chemical properties
- Chemical purity
- Chemical reaction
- Chemical reaction engineering
- Chemical reaction models
- Chemical reactor
- Chemical safety
- Chemical safety assessment
- Chemical shift
- Chemical space
- Chemical species
- Chemical stability
- Chemical state
- Chemical structure
- Chemical substances
- Chemical symbols
- Chemical synapse
- Chemical synthesis
- Chemical test
- Chemical thermodynamics
- Chemical transport model
- Chemical vapor transport
- Chemical waste
- Chemical weapons
- Chemically defined media
- Chemically defined medium
- Chemically inert
- Chemically modified electrodes
- Chemiluminescence
- Cheminformatics
- Chemiosmosis
- Chemiresistor
- Chemisorption
- Chemistry
- Chemkin
- Chemogenetics
- Chemoheterotrophic
- Chemokine receptors
- Chemokines
- Chemolithoautotrophic
- Chemometrics
- Chemoprophylaxis
- Chemoreceptors
- Chemoselectivity
- Chemostat
- Chemosynthesis
- Chemotherapy
- Chemotherapy-induced nausea and vomiting
- Chemotroph
- Chemotype
- Cheralite
- Cherenkov luminescence imaging
- Cherenkov radiation
- Chert
- Chest pain
- Chest trauma
- Chest tube
- Chest wall
- Chevrel phases
- Chevron
- Chewing
- Chi
- Chi distribution
- Chi-squared distribution
- Chi-squared test
- Chiasm
- Chiastolite
- Chicken wire
- Chickenpox
- Chicory
- Chilblains
- Child processes
- Childhood blindness
- Childhood cancer