China 
Africa 
- Nitroxide-mediated radical polymerization
- Nitryl
- Nlogit
- Nm
- Nmap
- No carrier
- No-cloning theorem
- No-fly zones
- No-load loss
- No-slip condition
- No-till farming
- NoSQL
- Noble gases
- Noble metals
- Nocebo
- Nociception
- Nociceptors
- Nocturia
- Nocturnal
- Nod2
- Nodal analysis
- Node
- Node-RED
- NodeMCU
- Nodes of Ranvier
- Nodularin
- Nodules
- Noether's theorem
- Noetherian rings
- Noggin
- Noise
- Noise abatement
- Noise barrier
- Noise control
- Noise dosimeter
- Noise floor
- Noise generators
- Noise map
- Noise margin
- Noise measurement
- Noise pollution
- Noise power
- Noise reduction
- Noise reduction coefficient
- Noise shaping
- Noise spectral density
- Noise temperature
- Noise-cancelling headphones
- Noise-equivalent power
- Noise-equivalent temperature
- Noise-induced hearing loss
- Noisy data
- Nomex
- Nominal group technique
- Nominal level
- Non-Hodgkin lymphoma
- Non-Mendelian inheritance
- Non-Newtonian fluids
- Non-abelian
- Non-abelian group
- Non-autonomous system
- Non-circular gears
- Non-classical logic
- Non-coding DNA
- Non-coding RNA
- Non-communicable disease
- Non-competitive inhibition
- Non-contact forces
- Non-convexity
- Non-covalent
- Non-covalent interactions
- Non-drying oil
- Non-equilibrium thermodynamics
- Non-euclidean geometry
- Non-ferrous metal
- Non-freezing cold injury
- Non-functional requirements
- Non-fungible token
- Non-heme iron enzymes
- Non-invasive
- Non-invasive ventilation
- Non-ionizing radiation
- Non-line-of-sight propagation
- Non-linear effects
- Non-linear least squares
- Non-local means
- Non-maleficence
- Non-metallic inclusions
- Non-monotonic logic
- Non-motile bacteria
- Non-negative matrix factorization
- Non-neutral plasma
- Non-nucleophilic bases
- Non-nucleoside reverse transcriptase inhibitor
- Non-pharmacological
- Non-photorealistic rendering
- Non-proteinogenic amino acids
- Non-renewable resources
- Non-repudiation
- Non-response bias
- Non-shrink grout
- Non-singular
- Non-smooth mechanics
- Non-stick
- Non-stoichiometric
- Non-volatile memory
- Non-zero dispersion-shifted fiber
- Nonane
- Nonce
- Noncentral chi-squared distribution
- Noncentral t-distribution
- Noncommutative harmonic analysis
- Noncommutative ring
- Nonconformity
- Nondestructive testing
- Nondimensionalization
- Nondispersive infrared sensor
- Nonholonomic system
- Nonintrusive load monitoring
- Noninvasive prenatal testing
- Nonlinear
- Nonlinear acoustics
- Nonlinear conjugate gradient method
- Nonlinear control
- Nonlinear dimensionality reduction
- Nonlinear distortion
- Nonlinear functional analysis
- Nonlinear optics
- Nonlinear partial differential equations
- Nonlinear photonic crystal
- Nonlinear programming
- Nonlinear regression
- Nonlinear resonance
- Nonlinear system identification
- Nonlinear systems
- Nonlocal operator
- Nonmetals
- Nonnegative matrix
- Nonnegative rank
- Nonoxynol
- Nonoxynol-9
- Nonparametric regression
- Nonpathogenic
- Nonpoint source pollution
- Nonprobability sampling
- Nonribosomal peptide
- Nonsense mutations
- Nonstandard analysis
- Nonsteroidal anti-inflammatory drugs
- Nonsteroidal antiandrogens