Helena Keith-Falconer, Countess of Kintore, formerly Helena Montagu, Duchess of Manchester (née Zimmerman; 25 September 1878[1] – 15 December 1971), was an American heiress who twice married into the British aristocracy, firstly to the 9th Duke of Manchester and then to the 10th Earl of Kintore.

[2] While attending a costume ball at a Brittany coast resort in Dinard, France, the twenty-one year old Helena met William Angus Drogo Montagu, 9th Duke of Manchester, who was then twenty-three.

He was the only son of the late 8th Duke of Manchester and his wife, the Cuban American heiress Consuelo Yznaga.

[2] In 1920, because of the Duke's gambling debts, they were forced to sell Kylemore Castle to Benedictine nuns who established a monastery on the grounds.

[17] Lord Kintore, the second son of Algernon Keith-Falconer, 9th Earl of Kintore (the Governor of South Australia in the 1890s)[18] and the former Lady Sydney Montagu (second daughter of George Montagu, 6th Duke of Manchester), fought in the Boer War between 1900 and 1902 with the Cameron Highlanders with the Scots Guard during World War I.

[20] As they had no children together, her husband's older sister, Lady Ethel Sydney Keith-Falconer (the wife of John Baird, 1st Viscount Stonehaven) became the suo jure 11th Countess of Kintore.