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

Mary Catherine

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Mary Katharine

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Mary Katherine

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  • 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

Fictional characters

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