Gannon is a surname. Notable people with the surname include:
Bob Gannon, 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, Computer Scientist, Professor at the University of Maryland
John Mark Gannon (1877–1968), former archbishop of the Diocese of Erie
Kelli Gannon (born 1978), former field hockey midfield player from the United States
Kim Gannon (1900–1974), American songwriter
Mary Gannon (b. 1868), cofounder of the architectural firm Gannon and Hands
Rich Gannon (born 1965), National Football League quarterback
Terry Gannon (born 1963), sportscaster for ESPN on ABC and ESPN
Charles Gannon (born 1974), singer, poet and songwriter
