- Core shroud
- Core-mantle boundary
- Corers
- Cores
- Corex process
- Corexit
- Corium
- Cork
- Corn ethanol
- Corn starch
- Corn syrup
- Corneal
- Corneal endothelium
- Corneal epithelial
- Corneal topography
- Corneocytes
- Corner detection
- Cornering force
- Cornerstone
- Corns
- Cornubian Batholith
- Corona
- Corona discharge
- Corona radiata
- Corona treatment
- Coronal plane
- Coronary
- Coronary CT angiography
- Coronary angiography
- Coronary arteries
- Coronary artery disease
- Coronary circulation
- Coronary ischemia
- Coronary sinus
- Coronary stent
- Coronary thrombosis
- Coronaviridae
- Coronavirus
- Coronavirus disease
- Coronene
- Coroutines
- Corpus
- Corpus callosum
- Corpus luteum
- Corrective action
- Corrective and preventive action
- Corrective lenses
- Corrective maintenance
- Correctness
- Correlated equilibrium
- Correlation
- Correlation clustering
- Correlation coefficient
- Correlation dimension
- Correlation does not imply causation
- Correlation function
- Correlation immunity
- Correlation integral
- Correlation sum
- Correlogram
- Correspondence
- Correspondence analysis
- Correspondence principle
- Correspondence problem
- Corresponding sides
- Corrosion
- Corrosion fatigue
- Corrosion inhibitors
- Corrugated boxes
- Corrugated fiberboard
- Cortex
- Corticobasal syndrome
- Corticomuscular coherence
- Corticospinal tract
- Corticosteroids
- Corticosterone
- Cortisol
- Corundum
- Corynebacterium glutamicum
- Cosine similarity
- Cosmesis
- Cosmic microwave background
- Cosmic rays
- Cosmic time
- Cosmids
- Cosmo solvation model
- Cosmological constant
- Cosolvent
- Cost accounting
- Cost analysis
- Cost contingency
- Cost driver
- Cost efficiency
- Cost engineering
- Cost escalation
- Cost estimates
- Cost of capital
- Cost of poor quality
- Cost-benefit analysis
- Cost-effective
- Cost-effectiveness analysis
- Cost-utility analysis
- Costal cartilage
- Costas loop
- Costate equation
- Costate equations
- Costimulatory
- Costovertebral joint
- Costovertebral joints
- Cotangent bundle
- Cotinine
- Cotton
- Cotton candy
- Cotton gin
- Cotton mills
- Cotton pad
- Cotton wool spots
- Cottrell atmosphere
- CouchDB
- Couette flow
- Cough
- Cough reflex
- Coulees
- Coulomb barrier
- Coulomb blockade
- Coulomb collision
- Coulomb damping
- Coulomb explosion
- Coulombic efficiency
- Coulometry
- Coulter
- Coulter counter
- Coumarin
- Coumarins
- Coumestrol
- Count data
- Countable set
- Countably additive
- Countdown
- Counter
- Counter-electromotive force
- Counterbore
- Countercurrent distribution
- Counterions
- Countermeasures
- Counterpoise
- Counterregulatory hormones
- Countersink
- Counterstain
- Counterweights