Mary Baker

Mary Baker may refer to:
 * Mary Baker (painter) (fl. 1842–1856), English painter
 * Bonnie Baker (baseball) (Mary Geraldine Baker, 1918–2003), American baseball player
 * Mary Baker Eddy (1821–1910), born Mary Baker, founder of Christian Science
 * Mary Landon Baker (1901–1961), American socialite and heiress famous for her romantic life
 * Princess Caraboo (1791–1864), English impostor
 * Mary E. Baker (1923–1995), African-American community activist
 * Mary Baker McQuesten (1849–1934), born Mary Jane Baker, activist
 * Mary Ann Baker (1831–1921), American composer and singer
 * Mary Lou Baker (1914–1965), member of the Florida House of Representatives and women's rights activist