Thomas O'Malley

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
 * 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, the alley cat in the film The Aristocats