Association football •
Mike Kelly (footballer, born 1942), English football goalkeeper and coach •
Mike Kelly (footballer, born 1954), English football midfielder •
Michael Kelly (footballer, born 1877), English footballer •
Michael Kelly (footballer, born 1996), Irish footballer for Carlisle United •
Michael Kelly (footballer, born 1997), Scottish footballer for Bristol Rovers
Baseball •
Michael Kelly (baseball) (born 1992) •
King Kelly (Michael Joseph Kelly, 1857–1894), Hall of Fame baseball player •
Mike Kelly (baseball, born 1896) (Bernard Francis Kelly, 1896–1968), American baseball player, coach and manager •
Mike Kelly (outfielder) (born 1970), American baseball player •
Mike Kelly (pitcher) (1902–1982), American baseball player
Gridiron football •
Mike Kelly (American football coach) (born 1948), University of Dayton football coach, 1981–2007 •
Mike Kelly (gridiron football) (born 1958), American college football and Canadian Football League coach •
Mike Kelly (gridiron football, born 1948), American college football and National Football League player
Other sports •
Mick Kelly (Australian footballer) (born 1952), Australian rules football player for Footscray •
Mike Kelly (basketball) (born 1967), American/Australian basketball coach and former player •
Michael Kelly (Gaelic footballer), Irish sportsperson who represented Donegal •
Mike Kelly (ice hockey) (born 1960), Canadian ice hockey executive •
Michael Kelly (sport shooter) (1872–1923), American Olympic sport shooter •
Mickey Kelly (1929–2011), Irish hurler •
Michael Kelly (athletic director), University of South Florida athletic director ==Business==