Africa 
China 
Japan 
MENA 
- Necessary condition
- Neck
- Neck dissection
- Neck pain
- Neck stiffness
- Necking
- Necroptosis
- Necrosis
- Necrotizing enterocolitis
- Necrotizing fasciitis
- Needle bearings
- Needle valves
- Needlestick injury
- Neem oil
- Nef reaction
- Negation
- Negation as failure
- Negative energy
- Negative feedback
- Negative feedback amplifier
- Negative impedance converter
- Negative index metamaterials
- Negative mass
- Negative numbers
- Negative pressure
- Negative refraction
- Negative relationship
- Negative resistance
- Negative temperature
- Negative thermal expansion
- Negative-feedback amplifier
- Negative-index metamaterial
- Negishi coupling
- Neglected tropical diseases
- Negligible function
- Negligible set
- Neighbor joining
- Neighborhood
- Neighborhood system
- Neighbourhood
- Neisseria meningitidis
- Nelson rules
- Nematodes
- Neoadjuvant
- Neoadjuvant therapy
- Neocognitron
- Neocortex
- Neocuproine
- Neodymium
- Neodymium chloride
- Neodymium magnets
- Neodymium oxide
- Neodymium(iii) oxide
- Neomycin
- Neon
- Neon lamps
- Neon signs
- Neon-sign transformer
- Neonatal care
- Neonatal encephalopathy
- Neonatal jaundice
- Neonatal meningitis
- Neonatal sepsis
- Neopentane
- Neopentyl glycol
- Neoplasms
- Neoprene
- Neos server
- Neosporin
- Neotectonic
- Neovascularization
- Nepers
- Nephelauxetic effect
- Nepheline
- Nepheline syenite
- Nephelinite
- Nephelometry
- Nephrectomy
- Nephrite
- Nephritis
- Nephrology
- Nephrons
- Nephrosclerosis
- Nephrotic syndrome
- Nephrotoxicity
- Neprilysin
- Neptunium
- Neptunium-237
- Nernst effect
- Nernst equation
- Nerol
- Nerve
- Nerve block
- Nerve conduction studies
- Nerve damage
- Nerve entrapment
- Nerve fiber layer
- Nerve guidance conduits
- Nerve injury
- Nerve root
- Nervous system
- Nervous tissue
- Nessler's reagent
- Nessus
- Nested PCR
- Nested dissection
- Nested functions
- Nested intervals
- Nested sampling algorithm
- Nestin
- Net
- Net force
- Net metering
- Net neutrality
- Net protein utilization
- Net radiometer
- Net tonnage
- Net zero emissions
- NetCDF
- NetLogo
- Netconf
- Netfilter
- Netlist
- Netrin 1
- Netting
- Network address
- Network allocation vector
- Network analyzers
- Network architecture
- Network calculus
- Network coding
- Network congestion
- Network convergence
- Network delay
- Network design
- Network forensics
- Network management
- Network management software
- Network mapping
- Network model
- Network monitoring
- Network on a chip
- Network operating system
- Network packet
- Network performance
- Network processor
- Network science
- Network security
- Network segment
- Network services