Ada Leverson (1862 - 1933) was a British writer who is now known primarily for her work as a novelist. She began writing during the 1890s, as a contributor to Black and White, Punch, and The Yellow Book. She was a loyal friend to Oscar Wilde, who called her Sphinx. She was a wit, and a friend of Max Beerbohm; her writing has been compared to Beerbohm's, and the stories of Saki.