Richard Edward O'Connor QC (4 August 1851 – 18 November 1912) was an Australian politician and judge. A barrister and later Queen's Counsel, O'Connor was active in the campaign for Australian Federation and was a close associate of Edmund Barton. He served as New South Wales Minister for Justice in the Dibbs ministry from 1891 to 1893 while a member of the New South Wales Legislative Council (1888–98), and was a member of the constitutional committee at the Federal Convention that drafted the Australian Constitution. A member of the first federal ministry as Vice-President of the Executive Council, O'Connor led the government in the Senate, the first person to do so, from 1901 to 1903, playing a key role in the development of that chamber's role in Australian politics.