Barry James O'Sullivan (born 24 March 1957) is an Australian politician who was appointed a member of the Australian Senate for the state of Queensland on 11 February 2014, representing the Liberal National Party (LNP). A former police detective, grazier, property developer and LNP executive treasurer, O'Sullivan was appointed by the Queensland Parliament to the Senate seat vacated by Barnaby Joyce, who had resigned to contest the House of Representatives seat of New England at the 2013 federal election.