Mary Miller may refer to:
- Mary Miller (art historian) (born 1952), American art historian, academic and Mesoamericanist scholar
- Mary Miller (actress) (1929–2020), English television and theatrical actress
- Mary Miller (artistic director) (active since 1990), artistic director of the Bergen National Opera, Norway
- Mary Miller (Colorado businesswoman) (1843–1921), founder of Lafayette, Colorado
- Mary Miller (politician) (born 1959), Representative for Illinois' 15th Congressional district
- Mary Miller (soprano) (died 1949), Australian soprano
- Mary Miller (writer) (active since 2009), American fiction writer
- Mary A. Miller (active 1858–1907), American missionary editor
- Mary J. Miller (born 1955), U.S. Under Secretary of the Treasury
- Mary Millicent Miller (1846–1894), American steamboat master
- Mary Rogers Miller (1868–1971), American writer and educator
- Mary Durack Miller (1913–1994), Australian author and historian
See also
- Mary Boykin Chesnut (née Miller, 1823–1886), American diarist
- Mary Miller Glasscock (1872–1925), wife of former West Virginia governor, William E. Glasscock
- Mary Millar (1936–1998), British actress of Keeping Up Appearances