The name John Parker may refer to any of these people:
- John Parker (Captain), (1729–1775), captain of minutemen in Battle of Lexington and Concord
- John Parker (delegate), (1758–1832), South Carolina delegate to the Continental Congress (1786-1788)
- John Parker (pioneer) (1758–1836), founder of Fort Parker in Texas, killed in the Fort Parker massacre
- John Parker (Privy Council), (1799–1881), British politician of the Victorian era, Privy Counsellor 1853
- John Mason Parker (1805–1873), American Whig (then Republican) Congressman rom New York
- John Parker (abolitionist), (1827–1900), African American abolitionist, inventor, and industrialist
- John M. Parker (1863–1939), Democratic governor of Louisiana from 1920 to 1924
- John Parker (journalist), English journalist who was a sports editor at ITN
- John Parker (judge), (1885–1958), an American judge who served at the Nuremberg Trials
- John Parker (UK politician), (1906–1987), British politician, Labour MP for Dagenham 1945-1983
- John Parker (scientist), American scientist with NASA Ames ablation Program
- John Parker (activist), American presidential candidate (2004) of the Workers World Party
- John Parker (cricketer) (born 1951), New Zealand test cricketer
- John L. Parker (fl. 1990s), Ontario politician
- John Parker (musician), of the band Nizlopi
- John Havelock Parker, former Commissioner of the Canadian Northwest Territories.
- John Parker (Montana), state representative of Montana.
- John Parker (water polo), water polo player from the United States
- John Frederick Parker, was President Abraham Lincoln's bodyguard
- John F. Parker, former mayor of the city of Taunton, Massachusetts
- John J. Parker, a U.S. judge who missed a nomination to the Supreme Court by one vote
- John Parker (Mormon), An early Mormon Convert who emigrated from England to Utah.
Also:
- John Parker (alien), fictional character in Buckaroo Banzai