Joseph Martin "Joe" Riordan AO (27 February 1930 – 19 November 2012) was an Australian politician and briefly government minister.Riordan was born in Sydney, raised as a Catholic, and educated at Patrician Brothers School and Marist Brother College in that city. He was the nephew of Darby Riordan, the Labor member of the House of Representatives for Kennedy from 1929 to 1936. He married Patricia Watkins in 1955; they had four sons and two daughters.