Christian Louis (German: Christian Ludwig; 25 February 1622 – 15 March 1665) was Duke of Brunswick-Lüneburg. A member of the House of Welf, from 1641 until 1648 he ruled the Principality of Calenberg, a subdivision of the duchy, and, from 1648 until his death, the Principality of Lüneburg. Christian Louis was born in Herzberg am Harz. In 1641, he inherited the Principality of Calenberg from his father, Duke George of Brunswick-Lüneburg, who had suddenly died. Like his father, he resided at the Leineschloss in Hanover.