Charles Spencer, 3rd Duke of Marlborough, (22 November 170620 October 1758), styled as The Honourable Charles Spencer between 1706 and 1729 and as The Earl of Sunderland between 1729 and 1733, was a British soldier, nobleman, and politician from the Spencer family. He briefly served as Lord Privy Seal in 1755. He led British forces during the Raid on St Malo in 1758.