Duncan, originally a Scottish name, may also refer to:
- King Duncan, a character in William Shakespeare's play Macbeth
- Duncan (fictional locomotive), a locomotive character in The Railway Series children's books by the Rev. W. Awdry
- Duncan, He-man's Man-At-Arms from the Masters of the Universe toyline, comics and cartoon
- Duncan Idaho, a fictional character in the Dune universe created by Frank Herbert
- Duncan Quagmire, a fictional character from A Series of Unfortunate Events
- Ser Duncan the Tall, a fictional character from Tales of Dunk and Egg, a series of novellas written by George R. R. Martin, set in the world of his Song of Ice and Fire cycle
- Duncan (mango), a named mango variety selected and patented in Florida.
- "Duncan" (song), a song by Paul Simon
- "Duncan", a song by Sarah Slean on the album Night Bugs
- "Duncan", a song by Pat Alexander made famous by Slim Dusty
- Clan Duncan
- Seymour Duncan, a manufacturer of guitar pickups and effects pedals
- Duncan Toys Company, an American toy manufacturer best known for its yo-yos
- Duncan I of Scotland (died 1040), king of Alba, represented in Shakespeare's play Macbeth
- Duncan II of Scotland (1060–1094), king of Scots
- Adam Duncan, 1st Viscount Duncan, British Admiral during the Napoleonic Wars
- Duncan (surname)
- Duncan (given name)
In the United States:
- Duncan, Arizona
- Duncan, Indiana
- Duncan, Iowa
- Duncan, Missouri (disambiguation)
- Duncan, Mississippi
- Duncan, Nebraska
- Duncan, North Carolina
- Duncan, Oklahoma
- Duncan, South Carolina
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