Lucy Clifford, better known as Mrs W K Clifford, was the wife of William Kingdon Clifford.

She was born Lucy Lane, the daughter of John Lane of Barbados, and married Clifford in 1875. After his death in 1879, she earned herself a prominent place in English literary life as a novelist, and later as a dramatist. Her best-known story, Mrs Keith's Crime (1885), was followed by several other volumes, the best-known of which is Aunt Anne (1893); and the literary talent in the family was inherited by her daughter, the poet Ethel Fisher Dilke, a poet.