Nullification may refer to: * Nullification (U.S. Constitution), a legal theory that a state has the right to nullify any federal law deemed unconstitutional with respect to the United States Constitution * Nullification Crisis, the 1832 confrontation between the U.S. government and South Carolina over the latter's attempt to nullify a federal law ** Ordinance of Nullification, declared the Tariffs of 1828 and 1832 null and void within the state borders of South Carolina * Jury nullification, a legal term for a jury's ability to deliver a verdict knowingly in contradiction to written law * Nullo (body modification), short for "genital nullification", a member of an extreme body modification subculture

See also