Mary Catherine, Mary Katharine, or Mary Katherine may refer to:

• Mary Catherine Bateson (1939–2021), American writer and cultural anthropologist
• Mary Catherine Bolton (1790/1791–1830), English actress
• Mary Catherine Bruton (1862–1937), Australian Roman Catholic nun, educator, and hospital administrator
• Mary Catherine Cuff (born 1947), American former Supreme Court justice
• Mary-Catherine Deibel (?–2023), American restaurant owner
• Mary Catherine Ferguson (1823–1905), Irish author and biographer
• Mary Catherine Garrison (born 1973), American actress
• Mary Catherine Judd (1852–1937), American educator, author of children's literature, and peace activist
• Mary Catherine Lamb (1949–2009), American textile artist
• Mary Catherine Loreto (?–1983), one of the Cassandra Martyrs of Charity
• Mary Catherine Nivert, birth name of Taffy Nivert (born 1944), American songwriter and singer
• Mary Catherine Phee (born 1963), American diplomat
• Mary Catherine Rowsell (1839–1921), English novelist, author of children's fiction, and dramatist

• Mary Katharine Brandegee (1844–1920), American botanist
• Mary Katharine Goddard (1738–1816), American postmaster, publisher, and book seller
• Mary Katharine Ham (born 1980), American journalist

• Mary Katherine Fechtel, American beauty pageant titleholder
• Mary Katherine Horony Cummings, real name of Big Nose Kate (1849–1940), Hungarian-born American outlaw, gambler, prostitute, and common-law wife of Doc Holliday
• Mary Katherine Linaker, birth name of Kay Linaker (1913–2008), American actress and screenwriter
• Mary Katherine Loyacano McCravey (1910–2009), American landscape- and still life painter

• Mary Katherine Blackwood, in Shirley Jackson's 1962 novel, We Have Always Lived in the Castle
• Mary Katherine Gallagher, in the US TV show Saturday Night Live, played by Molly Shannon

Name list

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