China 
Africa 
- Child Syndrome
- Child abduction
- Child and Adolescent Mental Health Services
- Child and family services
- Child behavior checklist
- Child development
- Child guidance
- Child life specialist
- Child mortality
- Child obesity
- Child protection
- Child psychology
- Child-Pugh score
- Childbirth
- Childhood Autism Rating Scale
- Childhood absence epilepsy
- Childhood amnesia
- Childhood arthritis
- Childhood autism
- Childhood blindness
- Childhood cancer
- Childhood depression
- Childhood diseases
- Childhood disintegrative disorder
- Childhood interstitial lung disease
- Childhood leukemia
- Childhood maltreatment
- Childhood mortality
- Childhood obesity
- Childhood trauma
- Childlessness
- Children of alcoholics
- Children with disabilities
- Children's Depression Inventory
- Children's hospices
- Chili pepper
- Chills
- Chimaerism
- Chimera
- Chimeric antibody
- Chimeric antigen receptor
- Chimeric antigen receptor T-cell
- Chimeric gene
- Chimeric proteins
- Chimerin
- Chin
- Chinese Classification of Mental Disorders
- Chinese finger trap
- Chinese herbal medicine
- Chinese herbs
- Chinese patent medicine
- Chip sequencing
- Chip-on-chip
- Chiral chromatography
- Chiral drugs
- Chiral resolution
- Chirality
- Chiropractic
- Chiropractic manipulation
- Chiropractors
- Chitin
- Chitin synthase
- Chitinase
- Chitobiose
- Chitosan
- Chitosanase
- Chives
- Chlamydia
- Chlamydia antibodies
- Chlamydia infection
- Chlamydia pneumoniae
- Chlamydia psittaci
- Chlamydia trachomatis
- Chlamydiaceae
- Chlamydial pneumonia
- Chlamydiales
- Chlamydophila
- Chlamydophila pneumoniae
- Chlamydophila psittaci
- Chlamydospores
- Chloasma
- Chloracne
- Chloral
- Chloral hydrate
- Chlorambucil
- Chloramine
- Chloramine-T
- Chloramine-t
- Chloramphenicol
- Chloramphenicol acetyltransferase
- Chloramphenicol resistance
- Chlordane
- Chlordecone
- Chlordiazepoxide
- Chlorella
- Chlorella vulgaris
- Chlorfenapyr
- Chlorhexidine
- Chlorhexidine gluconate
- Chloride
- Chloride channel blocker
- Chloride channels
- Chloride ion
- Chloride shift
- Chlorides
- Chlorin
- Chlorinated hydrocarbons
- Chlorination
- Chlorine compounds
- Chlorine dioxide
- Chlorisondamine
- Chlormadinone
- Chlormadinone acetate
- Chlormequat
- Chlormethine
- Chlormezanone
- Chloroacetaldehyde
- Chloroacetamide
- Chloroacetic acid
- Chloroacetyl chloride
- Chloroauric acid
- Chlorobi
- Chlorobutanol
- Chloroethane
- Chlorofluorocarbons
- Chlorogenic acid
- Chloroma
- Chloromethyl methyl ether
- Chlorophenol
- Chlorophenoxy herbicides
- Chlorophyll
- Chlorophyll a
- Chlorophyll b
- Chlorophyllase
- Chlorophyllin
- Chloropicrin
- Chloroplast DNA
- Chloroplasts
- Chloroprene
- Chloroprocaine
- Chloroquine
- Chlorosis
- Chlorothalonil
- Chlorothiazide
- Chlorotoxin
- Chlorovirus
- Chloroxylenol
- Chlorphenamine
- Chlorpheniramine
- Chlorpheniramine maleate