Nonstandard (disambiguation)

Nonstandard describes a state not conforming to standards.

Nonstandard or non-standard may also refer to:
 * non-standard analysis, the use of infinitesimals to formulate calculus
 * non-standard model, in model theory, a model that is not isomorphic to the standard model, especially models of Peano arithmetic
 * non-standard cosmology, models which do not conform to current scientific consensus