Joseph or Joe Duncan may refer to:
- Joseph Duncan (politician) (1794–1844), sixth Governor of the state of Illinois (1834–1838)
- Joseph Alfred Duncan (born 1993), Ghanaian footballer
- Joseph Edward Duncan (1963–2021), American convicted serial killer and child molester
- Joseph Forbes Duncan (1879–1964), Scottish trade unionist and politician
- Joe Duncan (baseball), American baseball player
- Joe Don Duncan (born 1990), American football player
This disambiguation page lists articles about people with the same name.
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