Thomas O'Malley
Thomas O'Malley may refer to:
- Thomas Francis O'Malley, American politician
- Thomas O'Malley (congressman), U.S. representative from Wisconsin
- Thomas J. O'Malley, American politician, lieutenant governor of Wisconsin
- Thomas O'Malley (writer), Irish writer
- Thomas P. O'Malley, American Jesuit and academic
- Thomas D. O'Malley Jr., American politician, treasurer of Florida
- Tom O'Malley, former American Major League Baseball player
- Tom O'Malley (American football), American football player
- T. J. O'Malley, American aerospace engineer
- Thomas O'Malley, British bassist, bassist for Ingested, Worm Shepherd and Steel Mage
- Thomas O'Malley, the alley cat in the film ''The Aristocats''