Augusta Mary Monica Crichton-Stuart, Marchioness of Bute, DBE, GCStJ (19 August 1880 – 16 May 1947), was an Anglo-Irish aristocrat who was a daughter of Sir Henry Bellingham, 4th Baronet, and Lady Constance Julia Eleanor Georgiana Noel, daughter of Charles Noel, 2nd Earl of Gainsborough.

Their wedding was held at Castle Bellingham, in the village of Castlebellingham in County Louth, Ireland, and was followed by a party at Mount Stuart House in Scotland.

[citation needed] After her marriage, Augusta Bellingham was styled as The Marchioness of Bute and her married name became Crichton-Stuart.

[citation needed] In recognition of her services, she was invested as a Dame Commander of the Order of the British Empire (DBE) in 1918.

[5] She was also invested as a Dame of Grace, Order of St. John of Jerusalem, and decorated with the Médaille de la Reine Elisabeth of Belgium.