Other
- John Parker (bishop) (died 1681), Church of Ireland clergyman
- John Parker (pioneer) (1758–1836), founder of Fort Parker in Texas, killed in the Fort Parker massacre
- John Palmer Parker (1790–1868), founder of the Parker Ranch of Hawaii
- John Parker (abolitionist) (1827–1900), African American abolitionist, inventor, and industrialist
- John Frederick Parker (1830–1890), bodyguard to Abraham Lincoln, derelict of duty the night of Assassination of Abraham Lincoln
- John Richard Parker (1830–1915?), American kidnapped by Native American raiding party
- Michael Parker (courtier) (John Michael Avison Parker, 1920–2002), Duke of Edinburgh's private secretary
- Sir John Parker (businessman) (born 1942), Chairman of National Grid and Captain of industry
- John Havelock Parker, former Commissioner of the Canadian Northwest Territories
- John Parker, fictional character in Buckaroo Banzai
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