Margaret Russell, Baroness Ampthill, ( Lady Margaret Lygon; 8 October 1874 – 12 December 1957) was an English courtier and Red Cross volunteer, known for her long friendship with Queen Mary. Russell was born at 13, Belgrave Square, London, to Frederick Lygon, 6th Earl Beauchamp and Lady Mary Stanhope, daughter of Philip Stanhope, 5th Earl Stanhope. She married the 2nd Baron Ampthill, a civil servant, in 1894. Lord Ampthill served as Governor of Madras from 1900 to 1906. Lady Ampthill was appointed a Companion of the Order of the Crown of India in 1900 and awarded a gold Kaisar-i-Hind Medal in 1906. Lady Ampthill first became friends with Queen Mary in 1891, when she was known as Princess May. Lady Margaret was appointed a Lady of the Bedchamber to Queen Mary in 1911, but was honoured by four monarchs for her charity work. In 1918, she was appointed a Dame Grand Cross of the Order of the British Empire for her work with the Red Cross during the First World War and a Dame Grand Cross of the Royal Victorian Order in 1946 for her work as a courtier. She was also a Dame of Grace of the Venerable Order of Saint John of Jerusalem. She died in hospital in London after a long illness. After her death, Viscount Templewood eulogised her in The Times and commented on her friendship with Queen Mary:

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Lady Margaret married Oliver Russell, 2nd Baron Ampthill in Madresfield, Worcestershire on 6 October 1894, two days before her 20th birthday. The Ampthills had four sons and one daughter: She died in Hammersmith, London, aged 83.

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