Mary Duncan (1894–1993) was an American stage- and film actress.
Mary Duncan may also refer to:
- Mary Duncan (writer) (born 1941), American writer, publisher, and educator
- Mary Ellen Duncan (1941–2022), American academic administrator and teacher
- Mary Lundie Duncan (1814–1840), Scottish poet and hymnwriter
- Mary Duncan, co-founder of W & M Duncan and Company
- Mary Duncan Library, Benson, North Carolina
- Mary Duncan, fictional character in The House by the Churchyard
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This disambiguation page lists articles about people with the same name.
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