Thomas Gallagher may refer to:
Politics Thomas Gallagher (Illinois politician) (1850–1930), U.S. Representative from Illinois Thomas Gallagher (Pittsburgh Mayor) (1883–1967), mayor of Pittsburgh Tom Gallagher (born 1944), Florida politician Tom Gallagher (Massachusetts politician), member of the Massachusetts House of Representatives Tommy Gallagher (politician) (1942–2025), Irish nationalist
Other Thomas C. Gallagher, chief executive officer of the Genuine Parts Company Thomas F. Gallagher (1897–1985), Minnesota Supreme Court judge, 1943–1967 Thomas Gerard Gallagher (born 1954), British professor Tommy Gallagher (rugby league) (born 1983), rugby league player for Leigh Centurions Tommy Gallagher (trainer), boxing trainer seen on TV show The Contender Tom Gallagher (diplomat) (1940–2018), American diplomat Thomas Gallagher (swimmer) (born 1999), Australian Paralympic swimmer Thomas Gallagher (writer) (1918–1992), American writer
See also Tom Gallacher (1932–2001), Scottish playwright