Thomas O'Malley may refer to: Thomas Francis O'Malley (1889–1954), American politician Thomas O'Malley (congressman) (1903–1979), U.S. representative from Wisconsin Thomas J. O'Malley (1868–1936), American politician, lieutenant governor of Wisconsin Thomas O'Malley (writer), Irish writer Thomas P. O'Malley (1930–2009), American Jesuit and academic Thomas D. O'Malley Jr. (1933–1998), American politician, treasurer of Florida Tom O'Malley (born 1960), former American Major League Baseball player Tom O'Malley (American football) (1925–2011), American football player T. J. O'Malley (1915–2009), American aerospace engineer Thomas O'Malley (born 2004), British bassist, bassist for Ingested, Worm Shepherd and Steel Mage Thomas O'Malley, the alley cat in the film The Aristocats