Lady Cynthia Mary Evelyn Asquith was an English writer, now known for her ghost stories and diaries. She also wrote novels and edited a number of anthologies, as well as writing for children and on the British Royal family.

Her father was Hugo Richard Charteris, 11th Earl of Wemyss (1857 – 1937) and her mother Mary Constance Wyndham (see The Souls). She married Herbert Asquith in 1910.

In 1913 she met D. H. Lawrence in Margate, and became a friend and correspondent.