Duncan could refer to:
- Duncan (18th century), an 18th century man from Scotland
- Duncan (USS Enterprise-D), a member of the sciences division on the USS Enterprise-D
- Duncan (Dorado), a crewman aboard the Dorado in the 23rd century
- Duncan Henrik IV, a lab administrator on Deep Space Research Station 39
- Duncan Smith, a colonel at Centaurus Defense Command
- Duncan K. Walsh, a 22nd century Earth Starfleet member
- Andrew Duncan, an administrative assistant on Sheridan's World
- Jon Duncan, a 23rd century doctor
- Macnair Duncan, owner of the Hayden Mill in Hayden, South Carolina
- Mark Duncan, a security lieutenant aboard the USS Enterprise
- Richard Duncan, a security ensign on the USS Enterprise-E
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