North Wiltshire was a local government district in Wiltshire, England, formed on 1 April 1974, by a merger of the municipal boroughs of Calne, Chippenham, and Malmesbury along with Calne and Chippenham Rural District, Cricklade and Wootton Bassett Rural District and Malmesbury Rural District. It shared its name with the North Wiltshire parliamentary constituency, the boundaries of which were coterminous with that of the district until 1997.