- Colpocleisis
- Colporrhaphy
- Colposcopy
- Colpotomy
- Columbamine
- Column chromatography
- Columnar epithelium
- Colwellia
- Colyte
- Coma
- Coma scale
- Comamonadaceae
- Comamonas
- Combat fatigue
- Combat stress reaction
- Combination antibiotic
- Combination chemotherapy
- Combination drug
- Combination product
- Combination reaction
- Combination therapy
- Combination tone
- Combinatorial chemistry
- Combined drug intoxication
- Combined hormonal contraception
- Combined hormonal contraceptive
- Combined hyperlipidemia
- Combined immunodeficiencies
- Combined immunodeficiency
- Combined oral contraceptive pill
- Combined pulmonary fibrosis and emphysema
- Combitube
- Combretastatin
- Combretastatin a-4
- Combretastatin a4
- Combretum
- Combustion
- Combustion analysis
- Comedo
- Comedogenic
- Comedown
- Comet assay
- Comfort
- Comfort food
- Commensal
- Commensalism
- Commercial determinants of health
- Comminuted fracture
- Commiphora myrrha
- Commission on Health Research for Development
- Commissures
- Commissurotomy
- Committed dose
- Commodity chemicals
- Common Technical Document
- Common Terminology Criteria for Adverse Events
- Common ancestry
- Common bile duct
- Common bile duct stone
- Common cardinal veins
- Common carotid artery
- Common cold
- Common disease-common variant
- Common extensor tendon
- Common facial vein
- Common fibular nerve
- Common gamma chain
- Common hepatic artery
- Common hepatic duct
- Common iliac arteries
- Common iliac artery
- Common iliac vein
- Common ingroup identity
- Common interosseous artery
- Common palmar digital arteries
- Common tendinous ring
- Common variable immunodeficiency
- Commonly prescribed drugs
- Commotio cordis
- 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
- 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