James, Jim or Jimmy Duncan may refer to:
- Jim Duncan (footballer) (born 1938), English professional footballer
- James Duncan (Pennsylvania) (1756–1844), American politician from Pennsylvania
- James H. Duncan (1793–1869), American politician from Massachusetts
- James Duncan (union leader) (1857–1928), Scottish-American union leader
- James Duncan (politician) (1858–1911), British lawyer and Liberal politician
- Jimmy Duncan (rugby union) (1869–1953), New Zealand rugby union footballer, coach and referee
- James Duncan (athlete) (1887–1955), American athlete
- Sir James Duncan, 1st Baronet (1899–1974), British politician
- James Duncan (bishop) (1913–2000), Episcopal bishop in America
- James Duncan (zoologist) (1804–1861), Scottish naturalist
- James Duncan (musician) (born 1968), Canadian-born musician, improviser and house music producer
- Jim Duncan (baseball) (1871–1901), American catcher and first baseman in Major League Baseball
- Jim Duncan (American football) (1924–2011), American football player and coach
- Jimmy Duncan (songwriter) (born 1935), American songwriter
- Jim Duncan (cornerback) (1946–1972), American football player
- Jimmy Duncan (U.S. politician) (born 1947), American politician from Tennessee
- Jamie Duncan (born 1975), American football linebacker
- James Hastings Duncan (1855–1928), British Liberal Member of Parliament for Otley, 1900–1918
- James Duncan (missionary) (1813–1907), New Zealand missionary and Presbyterian minister
- Jim Duncan (Alaska politician) (born 1942), former Speaker of the Alaska House of Representatives
- J.N. Duncan, author
Famous quotes containing the words james and/or duncan:
“As a work of art it has the same status as a long conversation between two not very bright drunks.”
—Clive James (b. 1939)
“I had learned to have a perfect nausea for the theatre: the continual repetition of the same words and the same gestures, night after night, and the caprices, the way of looking at life, and the entire rigmarole disgusted me.”
—Isadora Duncan (1878–1927)