Thomas McMahon may refer to:
Thomas McMahon (Irish republican) (born 1948), IRA member Thomas McMahon (bishop) (1936–2025), Roman Catholic bishop of Brentwood Thomas A. McMahon (1943–1999), novelist and professor of applied mechanics and biology at Harvard University Thomas John McMahon (1864–1933), Australian photojournalist Thomas J. McMahon (1948–1969), American soldier and Medal of Honor recipient Sir Thomas McMahon, 2nd Baronet (1779–1860), commander-in-chief of Bombay, 1840–1847 Sir Thomas Westropp McMahon, 3rd Baronet (1813–1892), 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) (1907–1975), Australian footballer for South Melbourne and Melbourne Tom McMahon (footballer, born 1918) (1918–2005), Australian footballer for Footscray Tom McMahon (American football) (born 1969), American football coach Tom McMahon Sr. (1883–1943), Australian rugby league referee and coach Tom McMahon Jr. (1906/1907–1969), Australian rugby league referee and coach