Mary Williams

Mary Williams may refer to:


 * Mary Ann Williams (1821–1874), American proponent for Memorial Day
 * Mary-Anne Williams, Australian thought leader on innovation, computer scientist, roboticist, and AI researcher
 * Mary Bushnell Williams (1826–1891), American author, poet, translator
 * Mary Mildred Williams (1847–1911), born into slavery in Virginia
 * Mary Rogers Williams (1857–1907), American artist
 * Mary Gilmore Williams (1863–1938), American professor of Greek
 * Mary Floyd Williams (1866–1959), American librarian and California historian
 * Mary Williams (caricaturist) (1869–1960), American caricaturist who used the pseudonym Kate Carew
 * Mary Wilhelmine Williams (1878–1944), historian
 * Mary Williams (professor) (1883–1977), Welsh academic of modern languages
 * Mary Lou Williams (1910–1981), American jazz pianist, composer, and arranger
 * Mary Lou Williams (album)
 * Mary A. Williams, a 19th-century Sandy Hook pilot boat
 * Mary Burrus Williams (born 1941), co-author of historical novels under the pen name Bronwyn Williams
 * Mary Alice Williams (born 1949), former television anchor
 * Mary Williams (Wisconsin politician) (born 1949), member of the Wisconsin State Assembly
 * Mary Ellen Coster Williams (born 1953), United States Court of Federal Claims judge
 * Mary Vesta Williams (1957–2011), American singer-songwriter
 * Mary Williams, real name of Kate Carew (1869–1961), American caricaturist
 * Mary Williams (activist) (born 1967), American social activist and adopted daughter of Jane Fonda
 * Mary Elizabeth Williams, American writer and commentator
 * Mary Williams (The Young and the Restless), fictional television character
 * Mary Williams, former Chief Secretary of the Isle of Man
 * Mary Frances Williams, American politician
 * Mary Theodore Williams (1868–1931), American Black Catholic nun
 * Mary Williams, character in Another Man, Another Chance