Mary Williams
Mary Williams may refer to:
- Mary Ann Williams, American proponent for Memorial Day
- Mary-Anne Williams, Australian thought leader on innovation, computer scientist, roboticist, and AI researcher
- Mary Burfitt Williams, Australian pathologist and physician
- Mary Burrus Williams, American novelist
- Mary Bushnell Williams, American author, poet, translator
- Mary Mildred Williams, born into slavery in Virginia
- Mary Rogers Williams, American artist
- Mary Gilmore Williams, American professor of Greek
- Mary Floyd Williams, American librarian and California historian
- Mary Williams (caricaturist), American caricaturist who used the pseudonym Kate Carew
- Mary Wilhelmine Williams, historian
- Mary Williams (professor), Welsh academic of modern languages
- Mary Lou Williams, American jazz pianist, composer, and arranger
- *Mary Lou Williams (album)
- Mary A. Williams, a 19th-century Sandy Hook pilot boat
- Mary Burrus Williams, co-author of historical novels under the pen name Bronwyn Williams
- Mary Alice Williams, former television anchor
- Mary Williams (Wisconsin politician), member of the Wisconsin State Assembly
- Mary Ellen Coster Williams, United States Court of Federal Claims judge
- Mary Vesta Williams, American singer-songwriter
- Mary Williams, real name of Kate Carew, American caricaturist
- Mary Williams (activist), 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, American Black Catholic nun
- Mary Williams, character in ''Another Man, Another Chance''