Others
- John Kennedy (1759–1842), English nurseryman, of Lee and Kennedy
- John Kennedy (manufacturer) (1769–1855), Scottish-born textile manufacturer in Manchester, UK
- John Kennedy (Medal of Honor) (1834–1910), American soldier
- John Stewart Kennedy (1830–1909), Scottish-born American entrepreneur & philanthropist
- John Kennedy (engineer) (1838–1921), Canadian
- John Thomas Kennedy (1885–1969), American soldier
- John F. Kennedy, Jr. (1960–1999), American political-family member & journalist, son of John F. Kennedy
- William John Kennedy (1919–2005), Australian activist
- John William Kennedy (born 1910), Northern Ireland politician
- John Kennedy (British Army officer) (1878–1948), British general
- John Noble Kennedy (1893–1970), British general
- John Kennedy (Manitoba politician), politician in Manitoba, Canada
- John Kennedy, 5th Earl of Cassilis (1575–1615), Scottish peer
- John Kennedy, 7th Earl of Cassilis (1653–1701), Scottish peer
- John Kennedy, 8th Earl of Cassilis (1700–1759), Scottish peer
- John David Kennedy (born 1943), chemist and professor of inorganic chemistry at the University of Leeds, UK
- John Doby Kennedy (1840–1896), general in the Confederate States Army during the American Civil War
- John Kennedy, 2nd Lord Kennedy (before 1454–c. 1508/9), Scottish lord
- John Wilfred Kennedy (1879–1949), farmer and political figure in Ontario, Canada
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