Charles Richard John Spencer-Churchill, 9th Duke of Marlborough, KG, TD, PC (13 November 1871 – 30 June 1934), styled Earl of Sunderland until 1883 and Marquess of Blandford between 1883 and 1892, was a British soldier and Conservative politician, and a close friend of his first cousin Winston Churchill. He was often known as "Sunny" Marlborough after his courtesy title of Earl of Sunderland.