Mathematics and Natural Science
- Neutral element, a special type of element in mathematics with respect to a binary operation on a set, such that if that binary operation is applied to any element in that set, that element is left unchanged. Also known as the "identity element".
- Neutral solution, a chemical solution which is neither acidic nor basic.
- Neutral particle, a particle without electrical charge.
- Neutral vector, a multivariate random variable that exhibits a particular type of statistical independence (Dirichlet distribution).
- Neutral organisms, in ecology, obey the unified neutral theory of biodiversity.
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