John Duncan

John Duncan may refer to:

Arts and entertainment

 * John Duncan (painter) (1866–1945), Scottish painter
 * John Duncan (artist) (born 1953), American artist and musician
 * Big John Duncan (born 1958), Scottish punk musician
 * John Duncan (harpist) (1904–1998), English musician

Law, military, and politics

 * John Duncan (Australian politician) (1845–1913), South Australian pastoralist and politician
 * John Duncan (Canadian politician) (born 1948), MP from British Columbia
 * John Duncan (New Zealand politician) (1848–1924), New Zealand politician
 * John D. C. Duncan Jr. (1884–1958), American politician and lawyer
 * John Edward Duncan (1884–1959), member of the New Zealand Legislative Council
 * John Duncan (US Administration) (born 1945), U.S. Department of the Treasury
 * John Riley Duncan (1850–1911), Texas lawman
 * John Duncan Sr. (1919–1988), U.S. Representative from Tennessee
 * John S. R. Duncan (1921–2006), British administrator in Sudan, then diplomat, high commissioner and ambassador
 * Jimmy Duncan (politician) (John James Duncan, Jr., born 1947), U.S. Representative from Tennessee, son of John Duncan, Sr., above
 * John Duncan (diplomat) (born 1958), British diplomat, ambassador for Multilateral Arms Control and Disarmament 2006–11
 * John Alton Duncan (1932–2007), Manitoba judge
 * John Duncan (British Army officer, born 1872) (1872–1948), British general
 * John Duncan (British Army officer, born 1870) (1870–1960), British general

Religion

 * John Duncan, a.k.a. John Dongan (fl. c. 1410), Manx religious leader
 * John Duncan (writer) (1721–1808), English miscellaneous writer and army chaplain
 * John Duncan (theologian) (1796–1870), aka Rabbi Duncan, Scottish religious leader and educator
 * John Duncan (priest) (born 1933), English Archdeacon of Birmingham from 1985 to 2001

Sports

 * Art Duncan (John Arthur Duncan, 1891–1975), Canadian ice hockey player
 * John Ross Duncan (born 1944), Australian cricketer
 * John Duncan (footballer) (1949–2022), Scottish football player and manager
 * John William Duncan (1885–1963), Welsh field hockey player

Others

 * John Duncan (author), American writer
 * John Duncan (botanist) (1794–1881), Scottish weaver and botanist
 * John Duncan (neuroscientist), (born 1953), British neuroscientist
 * John Duncan (surgeon) (1839–1899), Scottish surgeon, President of the Royal College of Surgeons of Edinburgh
 * John Duncan (weaver) (fl. 1800–1818), Scottish writer on weaving
 * John Duncan (traveller in Africa) (1805–1849), Scottish traveller in Africa
 * John Charles Duncan, American astronomer
 * John H. Duncan (1855–1929), American architect
 * John Holt Duncan (1820–1896), one of eight founders of Beta Theta Pi, a college fraternity at Miami University
 * John S. Duncan (born 1955), British neurologist

Johnny Duncan

 * Johnny Duncan (actor) (1923–2016), American actor
 * Johnny Duncan (bluegrass musician) (1931–2000), American skiffle and bluegrass musician
 * Johnny Duncan (country singer) (1938–2006), American country-music singer
 * Johnny Duncan (footballer) (1896–1966), Scottish football player and manager associated with Leicester City