David Leslie, 1st Lord Newark (c. 1600–1682) was a Scottish-born cavalry officer. He fought for the Swedish army of Gustavus Adolphus during the Thirty Years' War. He had entered Swedish service in 1630, serving as a captain in the regiment of Alexander Leslie (future Earl of Leven). He returned to Scotland just before the end of the Bishops' War, and participated in the English Civil War and Scottish Civil Wars.