John Morgan may refer to:

• John Morgan (economist) (1967–2021), American economist
• John Morgan (etiquette expert) (1959–2000), British expert on etiquette
• John Morgan (mathematician) (born 1946), mathematician at Stony Brook University
• John Minter Morgan (1782–1855), author and philanthropist
• John Henry Morgan (born 1945), American professor of the history and philosophy of social science
• J. R. Morgan (born 1950), classicist and author, Swansea University

• John Morgan (poet) (1688–c. 1733), Welsh clergyman, scholar and poet
• John Morgan (artist) (1822–1885), British painter
• John Morgan (comedian) (1930–2004), Welsh-born Canadian comedian
• John Morgan (sportscaster) (born 1950), American broadcaster and television producer
• John Morgan (The Wurzels) (1941–2021), drummer for The Wurzels

• John Morgan (admiral) (born 1950), United States Navy admiral
• John Hunt Morgan (1825–1864), Confederate general during the American Civil War
• J. H. Morgan (1876–1955), British general and lawyer
• John C. Morgan (1914–1991), United States Army Air Forces pilot and Medal of Honor recipient

• John W. Morgan (born 1964), mayor (2000-2012) of Cape Breton Regional Municipality, Nova Scotia

• John Morgan (by 1524 – will proved 1559) (died 1550s), MP for Monmouth Boroughs
• John Morgan (fl. 1563), MP for Carmarthen Boroughs
• John Morgan (died by 1572), MP for Leominster
• John Morgan (merchant) (died 1715), Member of Parliament for Monmouth, 1701–1705
• Sir John Morgan, 2nd Baronet (c. 1650–1693), Member of Parliament for Radnor, 1681, and Herefordshire, 1685–1693
• John Morgan (of Rhiwpera) (1671–1720), Member of Parliament for Monmouthshire, 1701–1720
• Sir John Morgan, 4th Baronet (1710–1767), Member of Parliament for Hereford, 1734–1741, and Herefordshire, 1765–1767
• John Morgan (of Dderw) (1742–1792), Member of Parliament for Brecon, 1769–1771, and Monmouthshire, 1771–1792
• John Morgan (British politician) (1892–1940), Labour MP for Doncaster, 1938–1941
• John Lloyd Morgan (1861–1944), Welsh MP for West Carmarthenshire, 1889–1910

• John Morgan (Wisconsin politician) (1846–1926), member of the Wisconsin State Assembly in 1917
• John G. Morgan (Tennessee politician)
• John Hill Morgan (1870–1945), American lawyer, politician, and art expert
• John J. Morgan (1770–1849), U.S. Representative from New York
• John S. Morgan (born 1963), member of the Maryland House of Delegates
• John T. Morgan (1824–1907), U.S. Senator
• John T. Morgan (judge) (c. 1830–1910), Chief Justice of the Idaho Supreme Court

• John Morgan (archdeacon of Bangor) (1840–1924)
• John Morgan (archbishop of Wales) (1886–1957), Archbishop of Wales, 1949–1957
• John Morgan (bishop of St David's) (died 1504)
• John Morgan (missionary) (1806–1865), New Zealand missionary
• John Morgan (dean of Waterford), Dean of Waterford, 1877–1903
• John Hamilton Morgan (1842–1894), leader and missionary in the LDS Church
• John Aloysius Morgan (1909–2008), Australian prelate of the Roman Catholic Church

• John Morgan (footballer, born 1855) (1855–1937), Welsh international footballer
• John Morgan (footballer, born 1876) (1876–?), Welsh international footballer
• Jock Morgan (John Morgan, 1889–1983), Scottish footballer

• Pepper Morgan (John L. Morgan, fl. 1930s), American baseball player
• John Adams Morgan (born 1930), American Olympic sailor
• John Morgan (golfer) (1943–2006), English golfer
• John Morgan (Australian footballer) (born 1953), Australian rules footballer for Melbourne
• John Morgan (wrestler) (born 1963), American Olympic wrestler
• John Morgan (rugby league) (fl. 1960s–1970s), Australian rugby league footballer
• John Morgan (cricketer) (born 1977), English cricketer
• John E. Morgan (born 1977), English golfer
• John Morgan (mixed martial arts journalist) (born 1978), American mixed martial arts journalist
• John Morgan (swimmer) (fl. 1984–1992), American Paralympic gold medal-winning swimmer

• John Morgan (physician) (1735–1789), founder of first medical school in colonial America at University of Pennsylvania
• John Morgan (British journalist) (1929–1988), Welsh journalist and broadcaster
• John Morgan (lawyer) (born 1956), lawyer, founder of the Morgan & Morgan law firm
• John Morgan (of Tredegar), Welsh nobleman
• J. P. Morgan Jr. (1867–1943), American banker
• J. P. Morgan (1837–1913), American banker
• John Morgan, 6th Baron Tredegar (1908-1962), Welsh peer and landowner

• SS John Morgan, 1943 World War II liberty ship

• John H. Morgan (disambiguation)
• Morgan (surname)