James, Jim, or Jimmy Duncan may refer to:
Politicians James Duncan (Pennsylvania politician) (1756–1844), American politician from Pennsylvania James Duncan (MP for Barrow-in-Furness) (1858–1911), British lawyer and Liberal politician James H. Duncan (1793–1869), American politician from Massachusetts James Hastings Duncan (1855–1928), British Liberal Member of Parliament for Otley, 1900–1918 Jim Duncan (Alaska politician) (born 1942), former Speaker of the Alaska House of Representatives, congressional candidate Jimmy Duncan (politician) (born 1947), American politician from Tennessee Sir James Duncan, 1st Baronet (1899–1974), British politician
Scientists, physicians, engineers
James Duncan (biomedical engineer), (born 1951), American professor of Biomedical Engineering at Yale James Duncan (surgeon) (1810–1866), Scottish surgeon and main manufacturer of chloroform in 19th century Britain James Duncan (zoologist) (1804–1861), Scottish naturalist James Matthews Duncan (1826–1890), Scottish physician
Sportspeople James Duncan (discus thrower) (1887–1955), American athlete James Duncan (football left-back) (fl. 1878–1882), Scottish footballer (Alexandra Athletic, Rangers and Scotland) James Duncan (football outside left) (fl. 1890–1893), Scottish footballer (Sheffield United) James Duncan (basketball) (born 1977), basketball coach Jamie Duncan (born 1975), American football linebacker Jim Duncan (baseball) (1871–1901), American catcher and first baseman in Major League Baseball Jim Duncan (cornerback) (1946–1972), American football player Jim Duncan (defensive end) (1924–2011), American football player and coach Jim Duncan (footballer) (born 1938), English professional footballer Jimmy Duncan (footballer, born 1930) (1930–2014), Scottish footballer Jimmy Duncan (rugby union) (1869–1953), New Zealand rugby union footballer, coach and referee
Others James Duncan (art collector) (1834–1905), Scottish sugar refiner and philanthropist James Duncan (bishop) (1913–2000), Episcopal bishop in America James Duncan (missionary) (1813–1907), New Zealand missionary and Presbyterian minister James Duncan (musician) (born 1968), Canadian-born musician, improviser and house music producer James Duncan (union leader) (1857–1928), Scottish-American union leader James Duncan (United States Army officer) (1811–1849), American artillery officer of the Mexican–American War Jimmy Duncan (songwriter) (1927–2011), American songwriter James Elmslie Duncan (1822–1854), English Chartist poet, editor, writer, and activist James K. L. Duncan (1845–1913), American soldier and Medal of Honor recipient James Duncan (tailor), Scottish tailor and landowner
See also Duncan James (born 1978), British singer with the band Blue Duncan James (disambiguation)