Michael O'Connor, S.J., (September 27, 1810 – October 18, 1872) was an Irish-born prelate of the Roman Catholic Church in the United States and a member of the Society of Jesus. He served twice as bishop of the Diocese of Pittsburgh in Pennsylvania (1843 to early 1853 and late 1853 to 1860). O'Connor served briefly as bishop of the Diocese of Erie for several months in 1853.