John Martin may refer to:

Business

• John Martin (businessman) (1820–1905), American lumberman and flour miller
• John Charles Martin (fl. 1913–1931), American newspaper publisher
• John Martin (publisher) (born 1930), American founder of Black Sparrow Press
• John C. Martin (businessman) (1951–2021), CEO of biotechnology company Gilead Sciences

Entertainment

• John Martin (actor) (born 1951), American actor
• John Martin (painter) (1789–1854), English painter
• John Blennerhassett Martin (1797–1857), American painter, engraver, and lithographer
• John Martin (bibliographer) (1791–1855), English bookseller, librarian, and writer
• John Martin (dance critic) (1893–1985), at The New York Times
• John Scott Martin (1926–2009), English actor
• John Martin (Canadian broadcaster) (1947–2006)
• John Martin (comedian) (born 1962), British
• John Martin (singer) (born 1980), Swedish
• John Martin (born 1946), also known as "The Big Figure", English drummer and member of Dr. Feelgood (1971-1982)
• John Martin, American film actor, in Browned Off (1944) and Mesa of Lost Women (1951)
• John Martin, Norwegian musician, husband and manager of pianist Natalia Strelchenko

Law

• John Martin (judge) (1784–1840), American judge of the Cherokee Tribal Court
• John C. Martin (judge) (born 1943), North Carolina state court judge
• John Donelson Martin Sr. (1883–1962), U.S. federal judge
• John E. Martin (1891–1968), Wisconsin state court judge
• John S. Martin Jr. (born 1935), U.S. federal judge

Military

• John Donelson Martin (1830–1862), Confederate States Army officer during the American Civil War
• John Martin (Royal Navy officer) (1918–2011), British admiral
• John Martin (New Zealand admiral), Chief of the Royal New Zealand Navy
• John L. Martin Jr. (1920–2009) US Air Force general

Politics

United Kingdom

• John Martin (MP for Berwick-upon-Tweed), British Member of Parliament for Berwick-upon-Tweed, 1529
• John Martin (died 1545), British Member of Parliament for Plympton Erle, 1529
• John Martin (died c. 1592), British Member of Parliament for Plympton Erle, 1554
• John Martin (1692–1767), British Member of Parliament for Tewkesbury, 1741–1747
• John Martin (1724–1794), British Member of Parliament for Tewkesbury, 1754–1761

• John Martin (1805–1880), British banker and Member of Parliament for Tewkesbury, 1832–1835
• John Martin (Young Irelander) (1812–1875), Young Irelander and Member of Parliament for Meath, 1871–1875

• John Hanbury Martin (1890–1983), British Member of Parliament for Southwark Central, 1940–1948
• John Martin (civil servant) (1904–1991), Winston Churchill's private secretary
• John Martin (Leicester MP), British Member of Parliament for Leicester, 1354
• John Martin, Bailiff of Guernsey, 1499–1510
• John Martin (1774–1832), British Member of Parliament for Tewkesbury, 1812–1832
• John Martin (Irish politician), Irish Member of Parliament for the Irish constituency of Sligo Borough, 1832–1837

United States

• John Martin (Governor of Georgia) (died 1786)
• John Martin (Governor of Kansas) (1839–1889)
• John Martin (Kansas politician) (1833–1913), U.S. Senator from Kansas
• John Andrew Martin (1868–1939), U.S. Representative from Colorado
• John C. Martin (politician) (1880–1952), U.S. Representative from Illinois
• John F. Martin Jr., American Ambassador to Costa Rica (1920–1921)
• John L. Martin (born 1941), American politician from Maine
• John Marshall Martin (1832–1921), Confederate politician
• John Mason Martin (1837–1898), U.S. Representative from Alabama
• John Preston Martin (1811–1862), U.S. Representative from Kentucky
• John W. Martin (1884–1958), governor of Florida
• John Martin (pioneer) (1827-1893), early pioneer of Monterey County, California

Other countries

• John Wills Martin (c. 1790–after 1843), English-born merchant and political figure in Newfoundland
• John Martin (New Zealand politician) (1822–1892), member of the New Zealand Legislative Council
• John S. Martin (politician) (1855–1946), politician in Prince Edward Island, Canada
• John Strickler Martin (1875–1931), farmer and politician in Ontario, Canada
• John Martin (Australian politician) (1890–1964), New South Wales politician
• John Martin (British Columbia politician), MLA of a provincial legislature since 2013

Sports

Baseball

• John Martin (baseball) (born 1956), American baseball pitcher
• J. D. Martin (John Dale Martin, born 1983), Major League Baseball pitcher
• Pepper Martin (Johnny 1904–1965), American baseball player

Cricket

• John Martin (cricketer, born 1867) (1867–1942), played for MCC and Devon
• John Martin (cricketer, born 1941), played for Oxford University, Somerset, Oxfordshire, and Devon
• John Martin (cricketer, born 1942), played for New South Wales
• Johnny Martin (cricketer) (John Wesley 1931–1992), Australian cricketer

Football

• John Martin (American football) (1895–?), American football player and coach
• Johnny Martin (American football) (1916–1968), American football player
• Alan Martin (footballer, born 1923) (John Alan 1923–2004), English footballer
• Johnny Martin (footballer) (1946–2013), English former footballer
• John Martin (goalkeeper) (born 1958), Scottish goalkeeper for Airdrieonians
• John Martin (Irish footballer) (born 1979), midfielder
• John Martin (English footballer) (born 1981)
• John Martin (footballer, born 1985) (born 1985), Scottish footballer
• John Martin (referee) (fl. 1978–1988), English association football referee

Other sports

• John Martin (American racing driver) (1939–2019), Indy 500 driver
• John Martin (Australian racing driver) (born 1984), Superleague Formula and British F3
• John Martin (figure skater), 1989–1994
• John Martin (Paralympian) (born 1943), Australian
• John Martin (sport shooter) (1868–1951)
• John A Martin (born 1948), English rugby league player
• John David Martin (born 1939), American track and field athlete

Other

• John Martin (Jamestown) (c. 1560–1632), settler and member of Council
• John Martin (meteorologist) (1789–1869), English physician and meteorologist
• John Martin (minister) (1741–1820), English Particular Baptist minister
• John Martin (priest) (1797–1878), Anglican priest in Ireland
• John Martin (headmaster) (1814–1876), educator in Adelaide, South Australia
• John Martin (oceanographer) (1935–1993), American scientist
• John Bartlow Martin (1915–1987), American author and ambassador
• John F. Martin, Deputy Supreme Knight of the Knights of Columbus, 1927–1933
• John Jeffries Martin, American academic and author
• John Joseph Martin (1922–1997), NASA engineer and administrator
• John Levi Martin (born 1964), American sociologist
• John William Martin (1860–1956), British Fabian and academic in the United States
• John Martin, American member of the Committee of Fifty
• John Martin, captain of Bartholomew Gosnold's ship when he found Martha's Vineyard
• John Martin's, former department store in Adelaide, Australia
• John Martin Brewery, Belgian brewery founded in 1909
• John Martin Scripps, a British-Singaporean killer, later executed