Africa 
China 
Japan 
MENA 
- Choppers
- Choquet integral
- Chord
- Chord diagram
- Chordae tendineae
- Chorioallantoic membrane
- Choriocapillaris
- Choriocarcinoma
- Chorismate
- Chorismate mutase
- Choroid plexus
- Choroidal
- Choroidal neovascularization
- Choropleth maps
- Chorus
- Chosen-ciphertext attack
- Chosen-plaintext attack
- Chow Test
- Christmas tree
- Christoffel symbols
- Christofides algorithm
- Chromate
- Chromate and dichromate
- Chromate conversion coating
- Chromatic number
- Chromaticity
- Chromatin
- Chromatin immunoprecipitation
- Chromatography
- Chromatography column
- Chrome
- Chrome alum
- Chrome plating
- Chrome steel
- Chrome vanadium
- Chrome yellow
- Chromel
- Chromic acid
- Chromite
- Chromitite
- Chromium
- Chromium carbide
- Chromium hydroxide
- Chromium oxide
- Chromium picolinate
- Chromium sulfate
- Chromium sulfide
- Chromium trioxide
- Chromium(iii) oxide
- Chromogenic
- Chromone
- Chromophores
- Chromosomal rearrangement
- Chromosomal translocation
- Chromosome 1
- Chromosome 12
- Chromosome 16
- Chromosome 17
- Chromosome 2
- Chromosome 21
- Chromosome 22
- Chromosome 3
- Chromosome instability
- Chromosome segregation
- Chromosomes
- Chronic
- Chronic conditions
- Chronic cough
- Chronic fatigue syndrome
- Chronic inflammation
- Chronic kidney disease
- Chronic liver disease
- Chronic pain
- Chronic pancreatitis
- Chronic stress
- Chronic thromboembolic pulmonary hypertension
- Chronic toxicity
- Chronic traumatic encephalopathy
- Chronic venous insufficiency
- Chronic wounds
- Chronoamperometry
- Chronology
- Chronostratigraphy
- Chronotropic
- Chroococcales
- Chrysin
- Chrysocolla
- Chrysolaminarin
- Chrysotile
- Chua's circuit
- Chuck
- Chunking
- Chunks
- Chuquicamata
- Churn turbulent flow
- Chutes
- Chyle
- Chylomicrons
- Chyme
- Chymosin
- Chymotrypsin
- Chymotrypsinogen
- Ciclosporin
- Cidofovir
- Cigarette filters
- Cigarettes
- Cilia
- Ciliary arteries
- Ciliary body
- Ciliary muscle
- Cilium
- Cimetidine
- Cinacalcet
- Cinchonine
- Cineole
- Cingulate cortex
- Cingulum
- Cinnabar
- Cinnamaldehyde
- Cinnamate 4-hydroxylase
- Cinnamic acid
- Cinnamon
- Cinnamoyl-coa reductase
- Cinnamyl alcohol dehydrogenase
- Cinnamyl-alcohol dehydrogenase
- Ciphers
- Ciphertext
- Ciphertext-only attack
- Ciprofloxacin
- Circadian clocks
- Circle
- Circle criterion
- Circle diagram
- Circle graph
- Circle grid analysis
- Circle of Willis
- Circle packing
- Circlips
- Circuit
- Circuit breakers
- Circuit complexity
- Circuit design
- Circuit diagram
- Circuit element
- Circuit topology
- Circulant matrix
- Circular arc
- Circular buffer
- Circular convolution
- Circular dichroism