Thomas McMahon
Thomas McMahon may refer to:
- Thomas McMahon (Irish republican), IRA member
- Thomas McMahon (bishop), Roman Catholic bishop of Brentwood
- Thomas A. McMahon, novelist and professor of applied mechanics and biology at Harvard University
- Thomas John McMahon, Australian photojournalist
- Thomas J. McMahon, American soldier and Medal of Honor recipient
- Sir Thomas McMahon, 2nd Baronet, commander-in-chief of Bombay, 1840–1847
- Sir [Thomas Westropp McMahon, 3rd Baronet], British Army officer
- Tom McMahon (Democratic operative), executive director of the Democratic National Committee
- Tom McMahon (mayor), American politician and former mayor of Reading, Pennsylvania
- Tom McMahon (footballer, born 1907), Australian footballer for South Melbourne and Melbourne
- Tom McMahon (footballer, born 1918), Australian footballer for Footscray
- Tom McMahon (American football), American football coach
- Tom McMahon Sr., Australian rugby league referee and coach
- Tom McMahon Jr., Australian rugby league referee and coach