China 
Africa 
Japan 
- Communicable disease control
- Communicable diseases
- Communicating hydrocephalus
- Communication apprehension
- Communication deviance
- Communication disorders
- Community Periodontal Index of Treatment Needs
- Community acquired pneumonia
- Community health
- Community hospitals
- Community mental health
- Community mental health center
- Community of practice
- Community pharmacist
- Community pharmacy
- Community psychiatry
- Community psychology
- Community resilience
- Community-acquired pneumonia
- Community-based rehabilitation
- Comorbid
- Comorbidities
- Comorbidity
- Companion cells
- Companion diagnostics
- Comparative anatomy
- Comparative genomic hybridization
- Comparative genomics
- Comparative medicine
- Comparative oncology
- Compartment
- Compartment syndrome
- Compassion
- Compassion fatigue
- Compassionate use
- Compensation
- Compensatory hyperhidrosis
- Competence
- Competency evaluation
- Competitive antagonist
- Competitive inhibition
- Complement
- Complement activation
- Complement cascade
- Complement component 3
- Complement component 5
- Complement control protein
- Complement deficiency
- Complement dependent cytotoxicity
- Complement factor
- Complement factor B
- Complement factor D
- Complement factor H
- Complement factor I
- Complement fixation
- Complement fixation test
- Complement membrane attack complex
- Complement receptor 1
- Complement receptor 2
- Complement receptors
- Complement system
- Complementarity
- Complementarity determining region
- Complementarity determining regions
- Complementary DNA
- Complementary and alternative medicine
- Complementary medicine
- Complementary therapy
- Complera
- Complete androgen insensitivity syndrome
- Complete dentures
- Complete heart block
- Completely randomized design
- Complex
- Complex cells
- Complex organism
- Complex partial seizure
- Complex partial status epilepticus
- Complex post-traumatic stress disorder
- Complex regional pain syndrome
- Complex training
- Complexation
- Complexin
- Complexion
- Compliance gaining
- Complications
- Complications of diabetes
- Complications of hypertension
- Complications of pregnancy
- Component causes
- Composite materials
- Composite resin
- Composting
- Composting toilets
- Compound 48-80
- Compound analgesics
- Compound heterozygosity
- Compound muscle action potential
- Compounding
- Comprehensive Aphasia Test
- Comprehensive geriatric assessment
- Comprehensive sex education
- Compressed air
- Compressed sensing
- Compression fracture
- Compression garment
- Compression of morbidity
- Compression therapy
- Compressor
- Compton scattering
- Compulsions
- Compulsive behavior
- Compulsive buying
- Compulsive hoarding
- Compulsive overeating
- Compulsive personality disorder
- Compulsive sexual behaviour disorder
- Compulsory sterilization
- Computational biology
- Computational chemistry
- Computational immunology
- Computational neuroscience
- Computed radiography
- Computed tomographic angiography
- Computed tomography angiography
- Computer aided drug design
- Computer assisted surgery
- Computer assisted tomography
- Computer vision syndrome
- Computer-aided diagnosis
- Computer-aided drug design
- Computer-assisted interventions
- Computer-assisted orthopedic surgery
- Computer-assisted surgery
- Computerized adaptive testing
- Computerized axial tomography
- Conalbumin
- Conantokins
- Conation
- Conatus
- Conbercept
- Concanavalin A
- Concatemers
- Concealer
- Concentration effect
- Concentration gradient
- Concept analysis
- Concept drift
- Concept learning
- Concept mapping