Ernest of Brunswick-Lüneburg (German: Ernst der Bekenner; 27 June 1497 – 11 January 1546), also frequently called Ernest the Confessor, was duke of Brunswick-Lüneburg and a champion of the Protestant cause during the early years of the Protestant Reformation. He was the Prince of Lüneburg and ruled the Lüneburg-Celle subdivision of the Welf family's Brunswick-Lüneburg duchy from 1520 until his death. He was the son of Henry I, Duke of Lüneburg, and Margarete of Saxony, the daughter of Ernest, Elector of Saxony.