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- Napierian logarithm
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- Nasopharyngeal swab
- Nastran
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- Natamycin
- National Center for Health Statistics
- National Geodetic Vertical Datum of 1929
- National Green Building Standard
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- National Quantum Initiative Act
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- Nationally determined contribution
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- Native
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- Natriuretic peptide
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- Natural Language Toolkit
- Natural abundance
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- Natural logarithm
- Natural logarithm of 2
- Natural mapping
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- Natural-language programming
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- Naturalized
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- Navicular bone
- Navier-Stokes equations
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- Nbs1
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- Nd-YAG
- Nd:yag laser
- Nd:yvo4
- Ndm-1
- Near Field
- Near net shape
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- Near-field optics
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- Near-infrared spectroscopy
- Near-sightedness
- Near-surface geophysics
- Nearest centroid classifier
- Nearest neighbor graph
- Nearest neighbour algorithm
- Nearest-neighbor interpolation
- Nearly free electron model
- Nebulin
- Nebulizer
- Necessarily true