Joan Olivia Wyndham (11 October 1921, in East Knoyle, Wiltshire – 8 April 2007, in London) was a British writer and memoirist who rose to literary prominence late in life through the diaries she had kept more than 40 years earlier, which were an account of her romantic adventures during the Second World War, when she was an attractive teenager who had strayed into London's Bohemian set. Her literary reputation rests on Love Lessons (1985) and Love Is Blue (1986), two selections from her diaries which led one critic to call her "a latterday Pepys in camiknickers."