- natural logarithm
- natural logarithmic function
- natural logarithm table
- natural mapping
- natural method
- natural monomorphism
- natural number
- natural number
- natural number of a logarithm
- natural numbers
- natural number table
- natural order on an inverse semigroup
- natural parameter
- natural parameter
- natural parameter of a straight line
- natural partial congruence
- natural spline
- natural system
- natural transformation of functors
- natural vibration
- natural vibration of structures
- nature exponential family of distribution
- nautical almanac
- nautical mile
- Navier method