Louisa Jane Montagu Douglas Scott, Duchess of Buccleuch and Queensberry VA (26 August 1836 – 16 March 1912) was the daughter of James Hamilton, 1st Duke of Abercorn. In 1884, she became the Duchess of Buccleuch and Duchess of Queensberry, the wife of William Henry Walter Montagu Douglas Scott, 6th Duke of Buccleuch and 8th Duke of Queensberry. She was the paternal grandmother of Princess Alice, Duchess of Gloucester, and of Marian Louisa, Lady Elmhirst, as well as a maternal great-grandmother of Prince William of Gloucester and Prince Richard, Duke of Gloucester, and a great-great-grandmother of Sarah, Duchess of York.