Mary Cavendish may refer to:
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Mary Talbot, Countess of Shrewsbury (1556–1632), née Mary Cavendish
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Mary Cavendish, Duchess of Devonshire (1895–1988), née Mary Gascoyne-Cecil
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Mary Cavendish, Duchess of Devonshire (1646–1710), née Mary Butler
*Mary Cavendish, the maiden name of the wife of
John Fane, 7th Earl of Westmorland
John Fane, 7th Earl of Westmorland (24 March 1685 – 26 August 1762), styled The Honourable John Fane from 1691 to 1733 and Lord Catherlough from 1733 to 1736, of Mereworth Castle in Kent, was a British Army officer and politician who sat in ...
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