Mary Caldwell may refer to:
- Mary Letitia Caldwell, American chemist
- Mary Gwendolin Caldwell, Marquise des Monstiers-Mérinville, American philanthropist and socialite
- Mary Tourtel, née Caldwell, British artist and creator of the comic strip Rupert Bear
- Mary Hay (actress), born Mary Hay Caldwell, American dancer and actress
This disambiguation page lists articles about people with the same name.
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