Michael O'Connor (1810–1872) was a U.S. (Irish-born) Jesuit and Roman Catholic bishop. He served as the first Catholic Bishop of Pittsburgh, Pennsylvania between August 15, 1843 and May 23 1860, except for the time between April 29, 1853 and February 20, 1854, when he was appointed the first Catholic Bishop of Erie.

Michael O'Connor (11 November 1865–6 July 1940) was a Member of the Western Australian Legislative Assembly from 1901 to 1904.

Michael O'Connor (born 06 October 1987, Belfast, Northern Ireland) is an Irish professional footballer who plays for Crewe Alexandra F.C.. O'Connor is a tough tackling, attacking midfielder.

Michael Patrick O'Connor is a left-handed pitcher for the Washington Nationals. He was born in Dallas, Texas and went to George Washington University. His MLB Debut was April 27, 2006 for the Washington Nationals against the St.

Michael David O'Connor born Nowra, New South Wales in 1960 was an Australian rugby league and rugby union player - a dual international. He represented the Wallabies in 12 Tests from 1979 to 1982 and the Kangaroos in 17 Tests from 1985 to 1990.