John Albert William Spencer-Churchill, 10th Duke of Marlborough (18 September 1897--11 March 1972) was the elder son of Charles Spencer-Churchill, 9th Duke of Marlborough and his first wife, the former Consuelo Vanderbilt, the American railroad heiress.
John Albert William Spencer-Churchill, 10th Duke of Marlborough (18 September 1897--11 March 1972), styled Marquess of Blandford until 1934, was a British peer. Marlborough was the elder son of Charles Spencer-Churchill, 9th Duke of Marlborough and his first wife, the former Consuelo Vanderbilt, the American railroad heiress.