Prince Charles Alexander of Lorraine (German: Karl Alexander von Lothringen und Bar; 12 December 1712 in Lunéville – 4 July 1780 in Tervuren) was a Lorraine-born Austrian general and soldier, field marshal of the Imperial Army, and governor of the Austrian Netherlands. Charles was the son of Leopold, Duke of Lorraine and Élisabeth Charlotte d'Orléans. When his elder brother Francis III, Duke of Lorraine, married the Archduchess Maria Theresa, daughter of Emperor Charles VI, Charles Alexander entered the Imperial service in 1737. During the War of the Austrian Succession, he was one of the principal Austrian military commanders. On 7 January 1744 he married Maria Theresa's only sister, Archduchess Maria Anna of Austria, thus making him doubly Maria Theresa's brother-in-law. The couple were jointly made Governors of the Austrian Netherlands.

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