The Convention of Klosterzeven (or the Convention of Kloster-Zeven – German: Konvention von Kloster Zeven) was a 1757 convention signed at Klosterzeven between France and the Electorate of Hanover during the Seven Years' War that led to Hanover's withdrawal from the war and partial occupation by French forces. It came in the wake of the Battle of Hastenbeck in which Hanover had suffered a devastating defeat. Following the battle the Army of Observation had retreated northwards until it had reached Stade.