John Gallagher

John Gallagher may refer to:

Sportspeople

 * John Gallagher (athlete) (1890–?), American long-distance runner
 * John Gallagher (baseball) (1892–1952), Major League Baseball player
 * John Gallagher (basketball) (born 1977), head men's basketball coach at the University of Hartford
 * John Gallagher (golfer) (born 1981), Scottish professional golfer
 * John Gallagher (ice hockey) (1909–1981), professional ice hockey player
 * John Gallagher (rugby) (born 1964), British-born New Zealand rugby union, and rugby league player
 * John Gallagher (rugby league), rugby league player for Batley
 * John Bán Gallagher, Gaelic footballer for Donegal
 * John J. Gallagher (coach) (1904–1982), American college football and basketball player and coach

Politicians

 * John E. Gallagher (politician), American politician
 * John P. Gallagher (1932–2011), American politician in the New Jersey Senate
 * John J. Gallagher (politician) (born 1944), American politician in the New Jersey General Assembly
 * John S. Gallagher (1849–1920), Ontario merchant and political figure

Others

 * John Gallagher (barrister), member of the board of the Australian Broadcasting Corporation
 * John Gallagher (bishop) (1846–1923), Irish-born bishop of the Australian Roman Catholic Archdiocese of Canberra and Goulburn
 * John Gallagher (cartoonist), American cartoonist
 * John Gallagher (geologist) (1916–1998), Canadian geologist and businessman
 * John Andrew Gallagher (1919–1980), British historian
 * John Gallagher Jr. (born 1984), American actor and musician
 * John Gallagher III (born 1947), American astronomer
 * John E. Gallagher (1958–2019), American television director
 * John M. Gallagher (born 1966), United States district judge
 * John Gallagher, guitarist/vocalist for the American death metal band Dying Fetus
 * John Gallagher, bassist/vocalist for the English heavy metal band Raven
 * John Gallagher (fl. 1830s), American naval commander, in command of USS Vandalia