China 
Africa 
- Superwarfarin
- Supination
- Supinator
- Supinator muscle
- Supine hypertension
- Supine position
- Supplementary eye field
- Supplementary motor area
- Support group
- Supported employment
- Supported living
- Supportive psychotherapy
- Suppository
- Suppression
- Suppuration
- Suprachiasmatic nucleus
- Suprachoroidal hemorrhage
- Supraclavicular fossa
- Supraclavicular lymph node
- Supraclavicular lymph nodes
- Supraclavicular nerve
- Supracondylar humerus fracture
- Supraglenoid tubercle
- Suprahyoid muscles
- Supramarginal gyrus
- Supramolecular chemistry
- Supraoptic nucleus
- Supraorbital artery
- Supraorbital foramen
- Supraorbital nerve
- Supraorbital ridge
- Supraorbital vein
- Suprapatellar bursa
- Suprapubic
- Suprapubic aspiration
- Suprapubic catheter
- Suprapubic cystostomy
- Suprarenal vein
- Suprascapular artery
- Suprascapular nerve
- Suprascapular notch
- Supraspinatus
- Supraspinatus muscle
- Supraspinous fossa
- Supraspinous ligament
- Suprasternal notch
- Supratentorial region
- Supratrochlear artery
- Supratrochlear nerve
- Supravalvular aortic stenosis
- Supravital staining
- Suprofen
- Sural arteries
- Sural artery
- Sural nerve
- Surface anatomy
- Surface and bulk erosion
- Surface dyslexia
- Surface ectoderm
- Surface plasmon resonance
- Surface-area-to-volume ratio
- Surfactant
- Surfactant protein A
- Surfactant protein B
- Surfactant protein C
- Surfactant protein D
- Surfactant therapy
- Surfactants
- Surfactin
- Surgency
- Surgeon
- Surgery
- Surgical emergency
- Surgical instruments
- Surgical intervention
- Surgical masks
- Surgical mesh
- Surgical oncology
- Surgical planning
- Surgical positions
- Surgical robot
- Surgical scissors
- Surgical sieve
- Surgical smoke
- Surgical specialties
- Surgical stress
- Surgicel
- Surotomycin
- Surra
- Surrogacy
- Surrogate endpoints
- Surrogation
- Survey meter
- Survey methodology
- Survival analysis
- Survival function
- Survival of Motor Neuron
- Survival of motor neuron
- Survivin
- Surviving Sepsis Campaign
- Survivor guilt
- Susac's syndrome
- Susceptibility weighted imaging
- Susceptible individual
- Sushruta Samhita
- Suspended animation
- Suspension
- Suspensory ligament
- Suspensory ligament of the ovary
- Sustainable diet
- Sustained attention
- Sustentacular cells
- Susto
- Sutherlandia frutescens
- Sutterella
- Suture material
- Sutures
- Suturing
- Suvorexant
- Suxamethonium
- Swainsonine
- Swallowing reflex
- Swan Ganz catheter
- Swan neck deformity
- Swarming motility
- Swayback
- Sweat glands
- Sweat test
- Sweating
- Swedish Interactive Thresholding Algorithm
- Swedish interactive thresholding algorithm
- Swedish mutation
- Sweeteners
- Sweetness
- Swelling capacity
- Swim bladder
- Swimmer's itch
- Swine flu
- Swine influenza
- Swine vesicular disease
- Swinging flashlight test
- Swinholide
- Swiss Statement
- Swiss cheese model
- Swiss-model
- Swollen glands
- Swyer syndrome
- SyNAPSE
- Sybr Green
- Sycosis