Dame Margaret Georgina Constance Guilfoyle ("née" McCartney; 15 May 1926 – 11 November 2020) was an Australian politician. She is a member of the Liberal Party. She served as a Senator for Victoria from 1971 to 1987. She was the first woman minister to administer a government department. She served as a minister for in the Fraser Government as Minister for Education (1975), Minister for Social Security (1975–1980) and Minister for Finance (1980–1983).