The North-West Frontier Province was a province of British India from 1901 to 1947, of the Dominion of Pakistan from 1947 to 1955, and of the Islamic Republic of Pakistan from 1970 to 2010. It was established on 9 November 1901 from the north-western districts of the British Punjab, during the British Raj. Following the referendum in 1947 to join either Pakistan or India, the province voted hugely in favour of joining Pakistan and it acceded accordingly on 14 August 1947. It was dissolved to form a unified province of West Pakistan in 1955 upon promulgation of One Unit Scheme and was reestablished in 1970. It was known by this name until 19 April 2010, when it was dissolved and redesignated as the province of Khyber Pakhtunkhwa following the passing of the Eighteenth Amendment to the Constitution of Pakistan, by President Asif Ali Zardari.

West Pakistan was the western province of Pakistan, one of the two provincial exclaves created under the One Unit Scheme in 1955 in Pakistan. It was created to ensure population-based equality with its eastern counter-part and it was dissolved to once again form former provinces for the General Elections in 1970 under the 1970 Legal Framework Order.