George, Duke of Brunswick-Lüneburg (17 February 1582, in Celle – 12 April 1641, in Hildesheim), ruled as Prince of Calenberg from 1635.

George was part of a cadet branch of the family known as the Dukes of Brunswick-Lüneburg, which held territories in what is now Lower Saxony in Germany.

George was the sixth son of William, Duke of Brunswick-Lüneburg (1535–1592) and Dorothea of Denmark (1546–1617).

She acted as a regent during the early years of his reign, keeping power from the Councillors who had mismanaged the estates during his father's fits of insanity.

He is a character in the Eric Flint series of science fiction novels, The Ring of Fire as the Duke of Brunswick-Lüneburg, a moderate conservative member of the Crown Loyalist faction, and commander of a division in the Army of the United States of Europe.