Joseph Duncan or Joe Duncan is the name of:

• Joseph Duncan (politician) (1794–1844), sixth Governor of the state of Illinois (1834–1838)
• Joseph E. Duncan III (born 1963), convicted sex offender and murderer in the 2005 kidnapping of Shasta and Dylan Groene and the murder of their family and Dylan
• Joseph Forbes Duncan (1879-1964), Scottish trade unionist and politician
• Joseph Alfred Duncan, Ghanaian footballer
• Joe Don Duncan (born 1990), American football player

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