John Gray may refer to:

• John Gray (North Carolina politician), American politician, member of the North Carolina General Assembly of 1777
• John C. Gray (1783–1823), United States representative from Virginia
• John Gray (socialist) (1799–1883), English economic pamphleteer, utopian socialist, and exponent of Ricardian economics
• John Gray (New Zealand politician) (1801–1859), member of the New Zealand Parliament
• John Hamilton Gray (Prince Edward Island politician) (1811–1887), Canadian politician, Premier of Prince Edward Island
• John Hamilton Gray (New Brunswick politician) (1814–1889), Canadian politician, Premier of New Brunswick
• Sir John Gray (Irish politician) (1815–1875), Irish Member of Parliament for Kilkenny, 1865–1875
• John Gray (Wisconsin politician, born 1817) (1817–?), American politician, member of the Wisconsin State Assembly
• John S. Gray (Idaho politician) (1833–1891), American politician, Lieutenant Governor of Idaho
• John Gray (Ontario politician) (1837–1917), Canadian politician, member of the Legislative Assembly of Ontario
• John Gray (New South Wales politician) (1841–1914), Australian senator
• John Gray (Victorian politician, died 1925) (c. 1853–1925), Australian politician, member of the Victorian Legislative Assembly
• John H. Gray (Illinois politician) (1855–?), Illinois state representative
• John Gray (North Dakota politician) (1877–1952), American politician, North Dakota State Treasurer
• John Austin Gray (1892–1939), Australian politician, member of the Victorian Legislative Assembly
• John R. Gray (politician) (1925−1996), American politician, member of the Wisconsin State Assembly
• Sir John Gray (diplomat) (1936–2003), British diplomat
• John Gray (Oshawa politician) (born 1959), former mayor of Oshawa, Ontario, Canada

• John Gray (barrister) (1807–1875), British barrister and legal writer
• John Chipman Gray (1839–1915), American law professor and legal scholar
• John Clinton Gray (1843–1915), American judge in New York
• John Joe Gray (1950–2023), fugitive from the law in Trinidad, Texas, United States

• John Gray (American Revolutionary War soldier) (1764–1868), U.S. soldier, said to be the longest surviving veteran of the war
• John Gray (Medal of Honor) (1836–1887), Medal of Honor recipient in the American Civil War
• Sir John Gray (Royal Navy officer) (1913–1998), British admiral
• John P. Gray (naval officer) (1914–1942), United States Navy officer, pilot, and Navy Cross recipient

• John Gray (American author) (born 1951), American author best known for his book Men Are from Mars, Women Are from Venus
• John Gray (Canadian author), Canadian journalist and biographer
• John Gray (composer), Australian film composer, writer of the score for 2006 film The Bet
• John Gray (mythologist) (1913–2000), Scottish author of books on history and mythology
• John Gray (poet) (1866–1934), English poet and Catholic priest
• John MacLachlan Gray (born 1946), Canadian writer, playwright and composer of musicals

• John Gray (1811–1891), Scottish engineer and philanthropist for whom the Gray's School of Art is named
• John Miller Gray (1850–1894), Scottish art critic and curator

• John Gray (museum administrator), American museum director
• John Gray (philosopher) (born 1948), British philosopher

• John Gray (Episcopalian minister) (1646–1717), minister of the Episcopal Church of Scotland
• John Gray (Scottish bishop) (1817–1872), Roman Catholic vicar apostolic for Western Scotland
• John Gray (archdeacon of Hong Kong) (1823–1890), Archdeacon of Hong Kong
• John R. Gray (minister) (1913–1984), Moderator of the General Assembly of the Church of Scotland in 1977
• John Gray (New Zealand bishop) (1947–2015), New Zealand Anglican bishop

• John Gray (mathematician) (died 1769), Scottish mathematician, author and Rector of Aberdeen University
• John Edward Gray (1800–1875), British zoologist
• John Franklin Gray (1804–1881), American educator and physician, first practitioner of homeopathy in the United States
• John Gray (locomotive engineer), locomotive superintendent of the London Brighton and South Coast Railway, 1845–1847
• John P. Gray (psychiatrist) (1825–1886), American psychiatrist
• John McFarlane Gray (1831–1908), Scottish engineer
• John H. Gray (economist) (1859–1946), American economist
• Sir John Gray (physiologist) (1918–2011), British physiologist
• John Stuart Gray (1941–2007), British-Norwegian marine biologist

• John Gray (Canadian banker) (c. 1755–1829), president of the Bank of Montreal
• John Gray, British founder of Gray and Davison pipe organ builders in 1841
• John S. Gray (businessman) (1841–1906), Scottish-born American candymaker, businessman, and first president of Ford Motor Company
• John Gray (British banker) (1934–2009), British banker

• John Gray (Australian footballer) (1888–1947), Australian rules footballer for Melbourne University FC and medical doctor
• John Gray (runner, born 1894) (1894–1942), American Olympic runner
• John Gray (boxer) (1906–1964), Filipino Olympic boxer
• Johnny Gray (baseball) (1926–2014), American baseball pitcher
• John Gray (English sportsman) (born 1948), English cricketer, and rugby union and rugby league footballer
• John Gray (ice hockey) (born 1949), Canadian ice hockey player
• Johnny Gray (born 1960), American runner

• John MacLachlan Gray (born 1946), Canadian playwright, composer, and performer
• John Gray (director), American writer and director
• John J. Gray, American television writer and producer
• John Gray, television news anchor on WXXA-TV in Albany, New York

• MV John Hamilton Gray, Canadian icebreaking railway, vehicle, and passenger ferry
• USS John P. Gray (APD-74), United States Navy high-speed transport

• John Gray (master mariner) (1819–1872), British captain of the SS Great Britain
• John Gray (nightwatchman) (died 1858), owner of Greyfriars Bobby
• John E. Gray (1907–2002), American educational administrator and businessman, president of Lamar University
• John Hunter Gray (1934–2019), American sociologist and civil rights activist

• Jon Gray (born 1991), American baseball player
• John de Gray (died 1214), Bishop of Norwich
• John Grey (disambiguation)
• Jonathan Gray (disambiguation)
• Jack Gray (disambiguation)