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Duncan may refer to:
- Duncan (Vault 81), a man who was slated to be the first overseer of Vault 81 before becoming ill, mentioned in Fallout 4.
- Duncan (child), the son of MacCready, mentioned in Fallout 4.
- R. Duncan, a criminal before the Great War, mentioned in Fallout 4.
- Duncan McKann, a deceased member of the Free States in Fallout 76.
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