Mary Alice Gascoyne-Cecil was born 25 July 1895 in Hatfield, Hertfordshire, England, United Kingdom to James Edward Hubert Gascoyne-Cecil, 4th Marquess of Salisbury (1861-1947) and Cicely Alice Gore (1867-1955) and died 24 December 1988 London, Greater London, England, United Kingdom of unspecified causes. She married Edward William Spencer Cavendish, 10th Duke of Devonshire (1895-1950) 21 April 1917 in Hatfield, Hertfordshire, England, United Kingdom.
Children
| Name | Birth | Death | Joined with |
| William John Robert Cavendish, Marquess of Hartington (1917-1944) | 10 December 1917 | 10 September 1944 Heppen, Belgium | Kathleen Agnes Kennedy (1920-1948) |
| Andrew Robert Buxton Cavendish, 11th Duke of Devonshire (1920-2004) | 2 January 1920 London, Greater London, England, United Kingdom | 3 May 2004 Chatsworth House, Derbyshire, England, United Kingdom | Deborah Vivien Freeman-Mitford (1920-2014) |
| Mary Cavendish (1922-1922) | |||
| Elizabeth Georgiana Alice Cavendish (1926-2018) | 24 April 1926 London, Greater London, England, United Kingdom | 15 September 2018 London, Greater London, England, United Kingdom | |
| Anne Evelyn Beatrice Cavendish (1927-2010) | |||
Footnotes (including sources)
| ‡ General |
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| ₪ Wedding |
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