Thomas McMahon

Thomas McMahon may refer to:
 * Thomas McMahon (Irish republican) (born 1948), IRA member
 * Thomas McMahon (bishop) (born 1936), 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