Nans

Nans may refer to :
 * Nans (worm), a genus of polychaete worms in the family Lopadorrhynchidae

It is the name or part of the name of several communes in France:
 * Nans, Doubs
 * Les Nans, Jura
 * Nans-les-Pins, Var
 * Nans-sous-Sainte-Anne, Doubs

"Nans" and the four-letter acronym NANS can also refer to:
 * N-acetylneuraminic acid synthase
 * NaN, a particular value of a numeric data type which is undefined as a number
 * North American Neuromodulation Society
 * National Association of Neighborhood Schools