John Gallagher

John Gallagher may refer to:

• John Gallagher, Jr. (born 1984), American actor and musician
• John Gallagher III, American astronomer
• John Gallagher (athlete) (born 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 (cartoonist), American cartoonist
• John Gallagher (geologist) (1916–1998), Canadian geologist and businessman
• John Gallagher (golfer) (born 1981), Scottish professional golfer
• John Gallagher (ice hockey) (1909–1981), professional ice hockey player
• John Gallagher (barrister), member of the board of the Australian Broadcasting Corporation
• John Gallagher (rugby league) (born 1964), rugby league player for Batley
• John Anthony Gallagher (born 1964), British-born New Zealand rugby union player
• John Andrew Gallagher (1919–1980), British historian
• John E. Gallagher, member of the Wisconsin State Assembly
• John S. Gallagher (born 1839), Ontario merchant and political figure
• John Gallagher, vocalist/guitarist for the American death metal band Dying Fetus
• John Gallagher, vocalist/bassist for the English heavy metal band Raven (band)