Gallaher is a surname. Notable people with the surname include:
Carolyn Gallaher, American academic Dave Gallaher, Irish-born New Zealand rugby union footballer David Gallaher, American video game writer Donald Gallaher, American actor Eddie Gallaher, American radio personality John Gallaher (born 1965), American poet and educator John S. Gallaher (1796–1877), American politician and newspaperman from Virginia Louisa Bernie Gallaher, American scientific photographer Simon Gallaher, Australian singer and pianist John Gallaher, American poet Patrick Gallaher, Irish ventriloquist Michael D. Gallaher, American business executive