Sportsmen
- Jack Barnes (English footballer) (John Barnes, 1908–2008), English professional footballer
- John Barnes (footballer) (born 1963), Jamaican-born England footballer
- John Barnes (Australian rules footballer) (born 1969), Australian rules footballer
- John Barnes (baseball) (born 1976), former Major League Baseball player
- John Barnes (manager) (1855–1929), Minor League Baseball manager
- John Barnes (cricketer) (1916–1943), Irish cricketer
- Johnnie Barnes (born 1968), American football player
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