Nonius

Nonius can refer to:

People

 * Romans belonging to the Nonia gens
 * Pedro Nunes (Latin: Petrus Nonius) (1502–1578), Portuguese astronomer and mathematician

Other

 * Nonius (horse), a breed of horse
 * Nonius (device), a precursor to the Vernier scale
 * Nonius (crater), a lunar crater