Lady Ottoline Violet Anne Morrell (16 June 1873 – 21 April 1938) was an English aristocrat and society hostess. Her patronage was influential in artistic and intellectual circles, where she befriended writers including Aldous Huxley, Siegfried Sassoon, T. S. Eliot and D. H. Lawrence, and artists including Mark Gertler, Dora Carrington and Gilbert Spencer.
Born Ottoline Violet Anne Cavendish-Bentinck, she was the daughter of Lieutenant-General Arthur Cavendish-Bentinck (son of Lord and Lady Charles Bentinck) and his second wife, the former Augusta Browne, later created Baroness Bolsover. Lady Ottoline's great-great-uncle (through her paternal grandmother, Lady Charles Bentinck) was the 1st Duke of Wellington. Through her father, Arthur, she was a first cousin once removed of Queen Elizabeth the Queen Mother, and thus a first cousin twice removed of Queen Elizabeth II, both of whom descended from Arthur's brother Charles Cavendish-Bentinck.