Eric II, Duke of Brunswick-Lüneburg (d. 1584)
Eric II, Duke of Brunswick-Lüneburg (10 August 1528 – 17 November 1584) was Duke of Brunswick-Lüneburg and ruler of the Principality of Calenberg from 1545 to 1584. Since 1495 the Principality of Göttingen was incorporated in Calenberg.

He was the son of Eric I and Elisabeth of Brandenburg. While he was still a minor, his mother acted as Regent and introduced the Reformation in Calenberg, including her children's conversion. However, in 1547 Eric II declared his reconversion to Roman Catholicism, to the dislike of his mother.