Helen Blackwood, Baroness Dufferin and Claneboye, later Helen Selina Hay, Countess of Gifford, born Helen Selina Sheridan, (1807 – 13 June 1867), was a British song-writer, poet, and author. As well as being admired for her wit and literary talents, she was a fashionable beauty and a well-known figure in London society of the mid-19th century.