John Harris may refer to:

• John Harris (Australian settler) (1754–1838), military surgeon, magistrate, and landowner in Australia
• John Harris (New South Wales politician) (1838–1911), Australian colonial politician, mayor of Sydney
• John Harris (Victorian politician) (1868–1946), Australian politician and Country Party minister
• John Harris (Australian politician) (1890–1974), Australian senator

• John Harris (MP for Hampshire) (died 1429), English MP for Hampshire 1415
• John Harris (MP for Grampound), English MP for Grampound, 1555
• John Harris (MP for West Looe) (c. 1564–1623), English MP for West Looe, 1614
• John Harris (MP for Montgomery) (died 1626), MP for Montgomery, 1601
• John Harris (Bere Alston MP) (1586–1657), English MP for Bere Alston and Launceston
• John Harris (Royalist) (1596–1648), English MP for Liskeard, 1628, 1640, 1644
• John Harris (died 1677) (1631–1677), English MP for Liskeard
• John Harris (merchant), British Member of Parliament for Exeter, 1708
• John Harris (courtier) (died 1767), British Member of Parliament for Ashburton
• John Harris (1703–1768), British Member of Parliament for Barnstaple
• John Harris (Bristol) (1725–1801), English merchant who was Mayor of Bristol in 1790
• John Dove Harris (1809–1878), English Liberal politician
• John Harris (engineer) (1812–1869), railway engineer of the Stockton and Darlington Railway 1836–47.
• John Harris (anti-slavery campaigner) (1874–1940), English missionary, campaigner against slavery, and Liberal Party politician
• John Harris, Baron Harris of Greenwich (1930–2001), British political aide and politician for Labour and Liberal Democrats
• John Quincey Harris (1815–1846), British Whig politician

• John Harris (New York politician) (1760–1824), Congressman from New York
• John Harris (Wisconsin politician) (1856–1933), Wisconsin state senator and businessman
• John S. Harris (1825–1906), United States Senator from Louisiana
• John T. Harris (1823–1899), United States Representative and lawyer from Virginia
• John Harris (Alaska politician) (born 1957), member of the Alaska House of Representatives
• John F. Harris (political aide) (born 1962), chief of staff for Illinois governor Rod Blagojevich
• John F. Harris (politician) (died 1913), American lawyer and politician from Greenville, Mississippi

• John Hyde Harris (1825/6–1886), New Zealand politician and cricketer
• John Bruce Harris (1903–1983), Canadian political figure in Saskatchewan
• John Gordon Harris (1947–2019), Canadian policeman

• John Harris (Warden) (1588–1658), English academic, clergyman, Warden of Winchester College
• John Harris (college head) (1802–1856), Congregational minister and college president
• John Howard Harris (1847–1925), president of Bucknell University, 1889–1919
• John Harris (bioethicist) (born 1945), professor of bioethics and think tank director
• John Harris (physicist) (born 1950), physics professor at Yale University
• John R. Harris (1934–2018), professor of economics at Boston University
• John Harris (phonologist), Irish linguist
• John Harris (psycholinguist), Irish linguist
• John Harris (biblical scholar), Australian biblical scholar and creolist

• John Harris Sr. (1673–1748), trader who settled and established Harrisburg, Pennsylvania
• John Harris (surveyor) (died 1772), farmer, land surveyor and political figure in Nova Scotia
• John Harris Jr. (settler) (1716–1791), American storekeeper and frontiersman
• John Williams Harris (1808–1872), New Zealand trader, whaler, and farmer
• John Harris (manufacturer) (1841–1887), Canadian businessman and manufacturer
• John P. Harris (1871–1926), Pittsburgh businessman
• John C. Harris (born 1943), owner of Harris Farms

• John Harris (writer) (1666–1719), English writer, scientist, and Anglican priest
• John Harris (spinet maker) (died 1772), Boston maker of spinets and harpsichords
• John Harris (publisher) (1756–1846), English bookseller and printseller
• John Harris Jr. (artist) (1791–1873), English artist
• John Harris (poet) (1820–1884), Cornish poet
• John H. Harris (entertainment) (1898–1969), American, first owner of the Ice Capades
• John Harris (novelist) (1916–1991), British author
• John Harris (curator) (1931–2022), English author, architectural historian
• John Harris (artist) (born 1948), painter and illustrator known for his science-fiction work
• John T. Harris (artist) (1908–1972), painter, printmaker, educator
• John Harris (critic) (born 1969), music and politics journalist
• John F. Harris (born 1960s), author and writer for Politico.com
• John Wyndham (John Wyndham Parkes Lucas Beynon Harris, 1903–1969), English science fiction author
• John Harris (software developer), computer programmer of Atari computer games

• John Harris (USMC officer) (1793–1864), 6th Commandant of the United States Marine Corps
• John Harris (Medal of Honor) (1839–?), Union Navy officer and Medal of Honor recipient
• Sir John Harris (RAF officer), British Royal Air Force officer

• John Harris (bishop) (1680–1738), Bishop of Llandaff, 1729–1738
• John Harris (priest) (1932–2019), Dean of Brecon

• John Hyde Harris (1825/6–1886), New Zealand politician and cricketer
• John Harris (English cricketer) (1936–2019), for Somerset County Cricket Club

• John Harris (Australian footballer) (1903–1993), former VFL player with Collingwood
• John Harris (footballer, born 1917) (1917–1988), Scottish footballer and manager
• John Harris (footballer, born 1939) (1939–2023), English footballer
• John Harris (Irish footballer), Northern Irish footballer and cricketer
• John Harris (defensive back) (born 1933), former American football cornerback
• John Harris (safety) (born 1955), former American football safety
• John Harris (wide receiver) (born 1991), American football player
• Tony Harris (footballer) (John Robert Harris, 1922–2000), Scottish footballer

• John Harris (canoeist) (born 1938), British canoeist
• John Harris (slalom canoeist) (born 1959), American slalom canoeist
• John Harris (athlete) (born 1945), Welsh Paralympic athlete
• John Harris (golfer) (born 1952), professional golfer
• John Harris (first baseman) (born 1954), former Major League Baseball player
• John Harris (pitcher), American Negro league pitcher
• John Elmo Harris (1952–2005), professional wrestler and actor, whose ring name was Silo Sam

• Frederick John Harris (1937–1965), known as John Harris, anti-apartheid activist
• John S. Harris (horticulturalist) (1826–1901), American horticulturalist
• John Richardson Harris (1790–1829), early settler of Mexican Texas
• John Solomon Harris, English Jewish pacifist

• John Benton-Harris (born 1939), American photographer
• John Burland Harris-Burland (1870–1926), British writer
• Johnny Harris (disambiguation)
• Jack Harris (disambiguation)
• Jonathan Harris (disambiguation)
• John H. Harris (disambiguation)