Broughton Barnabas O'Conor (1 November 1868 – 2 February 1953) was an Australian politician.
He was born at Broughton Creek near Nowra to John O'Conor and Anne Stuart. He attended public schools before matriculating at Sydney Grammar School and then studying at the University of Sydney, receiving a Bachelor of Arts in 1892 and a Bachelor of Law in 1895. He was callred to the bar in 1895. In 1898 he was elected to the New South Wales Legislative Assembly for Sherbrooke, representing the National Federal Party. On 25 April 1901, O'Conor married Icey Britania Johnson; they had two sons. An independent at the 1901 election, he was re-elected as a Liberal in 1904. In that year he was also appointed Minister for Public Instruction and Minister for Labour and Industry. He retired at the 1907 state election, and in July 1908 was appointed to the New South Wales Legislative Council, where he served as a Liberal, Nationalist and United Australia Party member until 1940. He died at Darlinghurst in 1953.