Clara Langhorne Clemens Samossoud, formerly Clara Langhorne Clemens Gabrilowitsch (June 8, 1874 – November 19, 1962), was the daughter of Samuel Clemens, who wrote as Mark Twain. She was a contralto concert singer and, as her father's only surviving child, managed his estate and guarded his legacy after his death. She was married twice—first to Ossip Gabrilowitsch, then (after Gabrilowitsch's death) to Jacques Samossoud. She wrote biographies of Gabrilowitsch and of her father. In her later life she became a Christian Scientist.