Africa 
China 
Japan 
MENA 
- Cricoid pressure
- Cricopharyngeal myotomy
- Cricopharyngeus muscle
- Cricothyroid joint
- Cricothyroid membrane
- Cricothyroid muscle
- Cricothyrotomy
- Crigler Najjar Syndrome Type I
- Crigler Najjar syndrome
- Crigler-Najjar syndrome
- Crime prevention
- Crimean Congo Hemorrhagic Fever
- Crimean-Congo hemorrhagic fever
- Crimean-Congo hemorrhagic fever virus
- Criminal profiling
- Crisaborole
- Crisis intervention
- Crista
- Crista ampullaris
- Crista galli
- Crista supraventricularis
- Crista terminalis
- Criterion-referenced tests
- Crithidia
- Crithidia fasciculata
- Crithidia luciliae
- Crithmum
- Critical Incident Technique
- Critical appraisal
- Critical band
- Critical care
- Critical care nursing
- Critical control point
- Critical illness
- Critical illness polyneuropathy
- Critical illness–related corticosteroid insufficiency
- Critical illumination
- Critical incident stress
- Critical incident stress management
- Critical limb ischemia
- Critical mass
- Critical periods
- Critical social work
- Critical thinking
- Crizotinib
- Crlx101
- Crocetin
- Crocidolite
- Crocus sativus
- Crofelemer
- Crohn's Disease Activity Index
- Crohn's disease
- Cromakalim
- Cronbach's alpha
- Cronkhite-Canada syndrome
- Cronobacter
- Cronobacter sakazakii
- Crospovidone
- Cross cultural psychology
- Cross education
- Cross fertilization
- Cross infection
- Cross linked polymer
- Cross linking reagent
- Cross modal plasticity
- Cross presentation
- Cross reaction
- Cross reactivity
- Cross resistance
- Cross syndrome
- Cross tolerance
- Cross validation
- Cross-cultural communication
- Cross-cultural psychiatry
- Cross-link
- Cross-matching
- Cross-presentation
- Cross-reactive carbohydrate determinants
- Cross-reactivity
- Cross-resistance
- Cross-sectional studies
- Cross-sectional study
- Cross-tolerance
- Cross-training
- Cross-validation
- Crossbite
- Crossflow filtration
- Crossing over
- Crosslinker
- Crosslinking of DNA
- Crossmodal
- Crossover experiment
- Crossover study
- Crosstalk
- Crotalidae polyvalent immune fab
- Crotamine
- Crotamiton
- Croton
- Croton lechleri
- Croton oil
- Croton tiglium
- Crotonaldehyde
- Crotonic acid
- Crotoxin
- Croup
- Crowding
- Crown
- Crown lengthening
- Crown rump length
- Crown-rump length
- Cruciate ligament
- Cruciferous vegetables
- Crude drugs
- Crude oil
- Crude protein
- Cruelty
- Crura
- Crural fascia
- Crush injury
- Crush syndrome
- Crutches
- Cruzipain
- Cry1Ac
- Cryab
- Crying
- Cryo-electron microscopy
- Cryo-transmission electron microscopy
- Cryoablation
- Cryobiology
- Cryocoolers
- Cryoelectron microscopy
- Cryoelectron tomography
- Cryofibrinogenemia
- Cryofixation
- Cryogenic grinding
- Cryogenic temperature
- Cryogenics
- Cryoglobulin
- Cryoglobulinemia
- Cryoglobulinemic vasculitis
- Cryolite
- Cryoneurolysis
- Cryoprecipitate
- Cryopreservation
- Cryopreservation of testicular tissue
- Cryoprobe
- Cryoprotectants
- Cryopyrin
- Cryopyrin-associated periodic syndrome
- Cryostat