Lady Gwendolen Gascoyne-Cecil (28 July 1860 – 28 September 1945) was a British author who wrote a four-volume biography of her father, Robert Gascoyne-Cecil, entitled Life of Robert, Marquis of Salisbury.
She also wrote a short story called The Little Ray for the August 1894 edition of Pall Mall Magazine.In October 2017, author Johnny Mains revealed Lady Gwendolen as the author of the story The Closed Cabinet - a work once considered anonymous