William Charles Wentworth AO (8 September 1907 – 15 June 2003), usually known as Bill Wentworth and sometimes referred to by others as William Charles Wentworth IV, was an Australian politician. He was a member of the Liberal Party for most of his career and held ministerial office in the governments of John Gorton and William McMahon, serving as Minister for Social Services (1968–1972) and Minister in charge of Aboriginal Affairs (1968–1971). Wentworth served in the House of Representatives from 1949 to 1977, representing the New South Wales seat of Mackellar. He frequently crossed the floor and served his final months in parliament as an independent.