John Fahey may refer to:
- John Fahey (musician) (1939–2001), American guitarist and composer
- John Fahey (politician) (born 1945), former state premier of New South Wales, Australia, and later Australian federal Finance Minister, current President of the World Anti-Doping Agency
- John M. Fahey, Jr., CEO and president of the National Geographic Society
- Jackie Fahey (born 1928), former Irish politician