Gainey is a surname. Notable people with the surname include:
Anna Gainey (born 1978), Canadian politician Bob Gainey (born 1953), Canadian ice hockey player Ed Gainey (born 1970), American politician Ed Gainey (Canadian football) (born 1990), American gridiron football player Edward Gainey (born 1956), American politician Justin Gainey (born 1977), American basketball coach Kathleen M. Gainey, American army general M. C. Gainey (born 1948), American actor Richard Gainey (1890–1975), Australian politician Sean Gainey, American army general Steve Gainey (born 1979), Canadian ice hockey player Tommy Gainey (born 1975), American golfer Ty Gainey (born 1960), American baseball player William Gainey (born 1956), American soldier