Mary Eleanor may refer to:
Mary Eleanor Bowes (1749–1800), English noble Mary Eleanor Brackenridge (1837–1924), American businesswoman, feminist, suffragist, and temperance activist Mary Eleanor Darwin (1842–1842), English daughter of Charles Darwin Mary Eleanor Donahue, birth name of Elinor Donahue (born 1937), American author and retired actress Mary Eleanor Fortescue-Brickdale (1872–1945), English artist Mary Eleanor Noble (1845–1925), English politician and parish historian Mary Eleanor Power (born 1949), American ecologist and professor of biology Mary Eleanor Spear (1897–1986), American data visualization specialist, graphic analyst, and author Mary Eleanor Wheeler, birth name of Mary Pearcey (1866–1890), English woman executed for murder Mary Eleanor Wilkins Freeman (1852–1930), American author