John Duncan
John Duncan may refer to:
Arts and entertainment
- John Duncan (painter), Scottish painter
- John Duncan (artist), American artist and musician
- Big John Duncan, Scottish punk musician
- John Duncan (harpist), English musician
Law, military, and politics
- John Duncan (Australian politician), South Australian pastoralist and politician
- John Duncan (Canadian politician), MP from British Columbia
- John Duncan (New Zealand politician), New Zealand politician
- John D. C. Duncan Jr., American politician and lawyer
- John Edward Duncan, member of the New Zealand Legislative Council
- John Duncan (US Administration), U.S. Department of the Treasury
- John Riley Duncan, Texas lawman
- John Duncan Sr., U.S. Representative from Tennessee
- John S. R. Duncan, British administrator in Sudan, then diplomat, high commissioner and ambassador
- Jimmy Duncan (politician), U.S. Representative from Tennessee, son of John Duncan, Sr., above
- John Duncan (diplomat), British diplomat, ambassador for Multilateral Arms Control and Disarmament 2006–11
- John Alton Duncan, Manitoba judge
- John Duncan (British [Army officer, born 1872)], British general
- John Duncan (British Army officer, born 1870), British general
Religion
- John Duncan, a.k.a. John Dongan, Manx religious leader
- John Duncan (writer), English miscellaneous writer and army chaplain
- John Duncan (theologian), aka Rabbi Duncan, Scottish religious leader and educator
- John Duncan (priest), English Archdeacon of Birmingham from 1985 to 2001
Sports
- Art Duncan, Canadian ice hockey player
- John Ross Duncan, Australian cricketer
- John Duncan (footballer), Scottish football player and manager
- John William Duncan, Welsh field hockey player
Others
- John Duncan (author), American writer
- John Duncan (botanist), Scottish weaver and botanist
- John Duncan (neuroscientist),, British neuroscientist
- John Duncan (surgeon), Scottish surgeon, President of the Royal College of Surgeons of Edinburgh
- John Duncan (weaver), Scottish writer on weaving
- John Duncan (traveller in Africa), Scottish traveller in Africa
- John Charles Duncan, American astronomer
- John H. Duncan, American architect
- John Holt Duncan, one of eight founders of Beta Theta Pi, a college fraternity at Miami University
- John S. Duncan, British neurologist
Johnny Duncan
- Johnny Duncan (actor), American actor
- Johnny Duncan (bluegrass musician), American skiffle and bluegrass musician
- Johnny Duncan (country singer), American country-music singer
- Johnny Duncan (footballer), Scottish football player and manager associated with Leicester City