The Longues-sur-Mer battery was a World War II artillery battery constructed by the Wehrmacht near the French village of Longues-sur-Mer in Normandy. It formed a part of Germany's Atlantic Wall coastal fortifications. The battery was completed by April 1944. Although constructed and manned initially by the Kriegsmarine, the battery was later transferred to the German army. The site consisted of four 152-mm navy guns, each protected by a large concrete casemate, a command post, shelters for personnel and ammunition, and several defensive machine-gun emplacements.