Hermione, Countess of Ranfurly, OBE, (née Llewellyn), was the British author of To War With Whitaker: The Wartime Diaries of the Countess of Ranfurly, 1939–1945. Published when Lady Ranfurly was in her eighties, these highly successful diaries were widely admired for their illustration of the writer's courage, pluck and humour.