The Invasion of Hanover takes place in 1757 during the Seven Years' War when a French army under Louis Charles César Le Tellier, duc d'Estrées, advances into the Electorate of Hanover and neighboring German states following the Battle of Hastenbeck.

French forces overrun most of Hanover, forcing the Hanoverian Army of Observation, intended to defend the Electorate, to Stade on the North Sea coast.

At the Convention of Klosterzeven the Duke of Cumberland agrees to disband his army and acknowledge the French occupation of the Electorate.

Following pressure by his British ministers, George II of Great Britain, Elector of Hanover, renounced the Convention and the German troops returned to active operations. By spring 1758, under a new commander, the Allied forces had driven the French out of Hanover and pushed them back across the River Rhine.