Sportspeople
- John Jackson (offensive tackle) (born 1965), former NFL offensive tackle
- John Jackson (wide receiver) (born 1967), former NFL player
- Johnnie Jackson (American football) (born 1967), cornerback
- John Jackson (athlete) (born 1941) British steeplechaser at the 1968 Olympics
- John Jackson (baseball) (1909–1956), Major League Baseball pitcher, 1933
- J. D. Jackson (basketball)
- John Jackson (boxer) (1769–1845)
- John Jackson (boxer born 1986)
- John Jackson (cricketer) (1833–1901), English cricketer
- John Jackson (football manager), first manager of Brighton and Hove Albion
- John Jackson (footballer born 1923), footballer for Stoke City
- John Jackson (footballer born 1942), goalkeeper who played for Crystal Palace F.C.
- John Jackson (Lancashire cricketer) (1841–1906), English cricketer
- John Jackson (Scottish footballer) (1906–1965), Scottish football goalkeeper (Partick Thistle FC, Chelsea FC)
- John Jackson (Somerset cricketer) (1898–1958), Chilean cricketer
- John Jackson (sport shooter) (1885–1971), American Olympic sport shooter
- John Jackson (Virgin Islands boxer) (born 1989), Olympic boxer from the Virgin Islands
- John Angelo Jackson (1921–2005), mountaineer
- John Jackson (Worcestershire cricketer) (1880–1968), English cricketer
- Bud Fowler (John Jackson, 1858–1913), pioneer black baseball player and club organizer
- John David Jackson (boxer) (born 1963), former super welterweight boxer
- John James Jackson (born 1977), British bobsledder and Royal Marines commando
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