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
See also
- Jon Duncan (born 1975), British orienteering world champion
- Jack Duncan (disambiguation)
- Jonathan Duncan (disambiguation)
- All pages with titles beginning with John Duncan
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