The Battle of Drakenburg () took place on 23 May 1547 to the north of Nienburg, between the Protestant army of the Schmalkaldic League and the imperial troops of Eric II, Duke of Calenberg. It resulted in an imperial defeat. Eric was forced to swim over the Weser River to save his own life. As a consequence, the imperial troops left northern Germany, contributing to freedom of religion for Lutherans and Catholics in northern Germany.