William Duncan may refer to:

• William Cary Duncan (1874–1945), American playwright and author
• William Duncan (actor) (1879–1961), Scottish-born actor and director of film serials
• W. Murdoch Duncan (1909–1976), Scottish crime thriller author

• Sir William Duncan, 1st Baronet (died 1774), Scottish physician
• William Duncan (American physician) (1840–1900)
• William Henry Duncan (1805–1863), English doctor and Britain's first Chief Medical Officer
• William Jolly Duncan (1894–1960), Scottish physicist

• William Addison Duncan (1836–1884), U.S. Representative from Pennsylvania
• William C. Duncan (1820–1877), brewer, politician, and mayor of Detroit, Michigan
• William Duncan (Maryland politician) (1871–1925), American politician and lawyer
• William Garnett Duncan (1800–1875), U.S. Representative from Kentucky

• Art Duncan (William James Arthur Duncan, 1891–1975), Canadian ice hockey professional and World War I flying ace
• Bill Duncan (1880–?), Scottish footballer
• William Butler Duncan II (1862–1933), American yachtsman and adoptive son of William Butler Duncan I
• William Dow Duncan (1892–1961), New Zealand rugby player
• William Duncan (Australian cricketer) (1912–1943), Australian cricketer
• William Duncan (footballer) (1913–1975), Scottish association football player
• William Duncan (New Zealand cricketer) (1933–2008), New Zealand cricketer
• William H. Duncan, American diplomat

• W. Butler Duncan I (1830–1912), Scottish-American banker and railroad executive
• William Augustine Duncan (1811–1885), Scottish journalist and colonial official
• William Barr McKinnon Duncan (1922–1984), Scottish-born director of Imperial Chemical Industries, chief executive of Rolls-Royce
• William Duncan (missionary) (1832–1918), English-born Anglican missionary
• William Duncan (philosopher) (1717–1760), Scottish natural philosopher and classicist
• William fitz Duncan (1090/1094–1147), Scottish prince and general
• William Wallace Duncan (1839–1908), American bishop of the Methodist Episcopal Church, South

• William Duncan Baxter (1868–1960), mayor of Cape Town, South Africa
• William Duncan Connor (1864–1944), lieutenant governor of Wisconsin
• William Duncan Herridge (1888–1961), Canadian politician
• William Duncan MacMillan (1871–1948), American mathematician and astronomer

Topics referred to by the same term

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