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 (Privy Council), (1799-1881), British politician of the Victorian era, Privy Counsellor 1853
• John Parker (abolitionist), (1827-1900), African American abolitionist, inventor, and industrialist
• 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 Parker (Ontario politician), (fl. 1990s), middle initial L
• John Parker (musician), of the band Nizlopi
• John Havelock Parker, a former Commissioner of the Northwest Territories.
• John Parker (Montana), a state representative of Montana.
• John Parker (water polo), a water polo player from the United States
• John M. Parker, Democratic governor of Louisiana from 1920 to 1924

Also:

• John Parker (alien), fictional character in Buckaroo Banzai