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
- Louisa Bernie Gallaher, American scientific photographer
- Simon Gallaher, Australian singer and pianist
- John Gallaher, American poet
- Michael Dale Gallaher, American Business Executive
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