Duncan MacMillan or Duncan Macmillan may refer to:
- Duncan Macmillan (playwright), a British playwright and director.
- Duncan Macmillan (art historian), Scottish academic and writer
- Duncan Macmillan (athlete) (1890–1963), British track and field athlete competitor in the 1912 Summer Olympics
- Duncan MacMillan (Bloomberg), co-founder of Bloomberg L.P.
- Duncan Macmillan (Canadian politician) (1837–1903), Canadian lawyer and Member of Parliament
- Duncan MacMillan (Nova Scotia politician) (1897–1969), former Nova Scotia politician
- Duncan Bruce MacMillan, former Alberta politician
See also
- Duncan McMillan (disambiguation)
- Duncan MacMillan High School, a secondary school in Sheet Harbour, Nova Scotia, Canada
- Duncan MacMillan Nursing Home in Sheet Harbour, Nova Scotia, Canada
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