Duncan MacMillan
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), British track and field athlete competitor in the 1912 Summer Olympics
- Duncan MacMillan (Bloomberg), co-founder of Bloomberg L.P.
- Duncan Macmillan (Canadian politician), Canadian lawyer and Member of Parliament
- Duncan MacMillan (Nova Scotia politician), former Nova Scotia politician
- Duncan Bruce MacMillan, former Alberta politician