Gannon is a surname. Notable people with the surname include:
Bob Gannon, American businessman and politicianCraig Gannon (born 1966), English guitaristJeff Gannon (born 1957), pen name of James Guckert, a former White House reporterJim Gannon (born 1968), English Football ManagerJim Gannon (rugby league) (born 1977), Australian professional rugby league playerJohn D. Gannon, Computer Scientist, Professor at the University of MarylandJohn Mark Gannon (1877–1968), former archbishop of the Diocese of ErieKelli Gannon (born 1978), former field hockey midfield player from the United StatesKim Gannon (1900–1974), American songwriterMary Gannon (b. 1868), cofounder of the architectural firm Gannon and HandsRich Gannon (born 1965), National Football League quarterbackTerry Gannon (born 1963), sportscaster for ESPN on ABC and ESPNCharles Gannon (born 1974), singer, poet and songwriter