Gannon is an Irish surname, meaning "descendant of the fair one," perhaps denoting someone of Norse ancestry in Ireland.[1] It may also derive from the Anglo-Saxon feminine name "Gunnhildr."[1] Notable people with the surname include:
- Bob Gannon (1959–2017), American businessman and politician
- Craig Gannon (born 1966), English guitarist
- Jeff Gannon (born 1957), pen name of James Guckert, a former White House reporter
- Jim Gannon (born 1968), English football manager
- Jim Gannon (rugby league) (born 1977), Australian professional rugby league player
- John D. Gannon (1948–1999, computer scientist, professor at the University of Maryland
- John Mark Gannon (1877–1968), former archbishop of the Diocese of Erie
- Jonathan Gannon, National Football League Coach
- Kelli Gannon (born 1978), former field hockey midfield player from the United States
- Kim Gannon (1900–1974), American songwriter
- Mary Gannon (1829—1868), American actress
- Mary Gannon (1867–1932), co-founder of the architectural firm Gannon and Hands
- Rich Gannon (born 1965), National Football League quarterback
- Theresa Gannon, British forensic psychologist
- Tim Gannon (born 1948), polo player, co-founder of Outback Steakhouse
- Terry Gannon (born 1963), sportscaster for ESPN on ABC and ESPN
- Tom Gannon (1943–2021), American politician
- Gannon University, university in Erie, Pennsylvania
- An early romanization/spelling error of Ganon, villain from Nintendo's video game series franchise The Legend of Zelda