The Countess of Ranfurly | |
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| Born | Hermione Llewellyn 13 November 1913 Postlip, Gloucestershire, England |
| Died | 11 February 2001 (aged 87) Buckinghamshire, England |
| Nationality | British |
Hermione Knox, Countess of Ranfurly, OBE (née Llewellyn; 13 November 1913 – 11 February 2001) was a British author and aristocrat who is best known for her war memoir To War With Whitaker: The Wartime Diaries of the Countess of Ranfurly, 1939–1945.