Dame Margaret Helen Greville, DBE (née Anderson; 20 December 1863 – 15 September 1942), was a British society hostess and philanthropist.

[6] Writing in 1933, Jean, wife of Sir Ian Hamilton wrote that at a dinner, Violet Bonham-Carter had "a violent discussion" with Greville about how Hitler was threatening Jewish people.

[7] In 1934, Greville attended a Nuremberg Rally, and returned to England reportedly "full of enthusiasm for Hitler", and visited Germany twice more in the late 1930s.

[citation needed] She bequeathed the house with its contents (described in an inventory completed in 1943) and estate at Polesden Lacey to the National Trust in memory of her father.

[citation needed] She bequeathed all her jewels to Queen Elizabeth (later the Queen Mother), including a diamond necklace reputedly belonging to Marie Antoinette, a pair of diamond chandelier earrings[10] and selection of tiaras and a ruby necklace by Boucheron,[11] all of which remain in the possession of the British royal family.

[17] By contrast, Sir Cecil Beaton described her as "a galumphing, greedy, snobbish old toad who watered at her chops at the sight of royalty ... and did nothing for anybody except the rich".