The Normandy landings (codenamed Operation Neptune) were the landing operations on 6 June 1944 (termed D-Day) of the Allied invasion of Normandy in Operation Overlord during World War II. The largest seaborne invasion in history, the operation began the invasion of German-occupied western Europe, led to the liberation of France from Nazi control, and contributed to an Allied victory in the war.

Planning for the operation began in 1943. In the months leading up to the invasion, the Allies conducted a substantial military deception, codenamed Operation Bodyguard, to mislead the Germans as to the date and location of the main Allied landings. The weather on D-Day was far from ideal, but postponing would have meant a delay of at least two weeks, as the invasion planners had requirements for the phase of the moon, the tides, and the time of day that meant only a few days in each month were deemed suitable. Hitler placed German Field Marshal Erwin Rommel in command of German forces and of developing fortifications along the Atlantic Wall in anticipation of an Allied invasion.

The amphibious landings were preceded by extensive aerial and naval bombardment and an airborne assaultthe landing of 24,000 British, US, and Canadian airborne troops shortly after midnight. Allied infantry and armoured divisions began landing on the coast of France starting at 06:30. The target 50-mile (80km) stretch of the Normandy coast was divided into five sectors: Utah, Omaha, Gold, Juno, and Sword Beach. Strong winds blew the landing craft east of their intended positions, particularly at Utah and Omaha. The men landed under heavy fire from gun emplacements overlooking the beaches, and the shore was mined and covered with obstacles such as wooden stakes, metal tripods, and barbed wire, making the work of the beach clearing teams difficult and dangerous. Casualties were heaviest at Omaha, with its high cliffs. At Gold, Juno, and Sword, several fortified towns were cleared in house-to-house fighting, and two major gun emplacements at Gold were disabled using specialised tanks.

The Allies failed to achieve all of their goals on the first day. Carentan, St. L, and Bayeux remained in German hands, and Caen, a major objective, was not captured until 21 July. Only two of the beaches (Juno and Gold) were linked on the first day, and all five bridgeheads were not connected until 12 June. However, the operation gained a foothold that the Allies gradually expanded over the coming months. German casualties on D-Day were around 1,000 men. Allied casualties were at least 10,000, with 4,414 confirmed dead. Museums, memorials, and war cemeteries in the area host many visitors each year.

Between 27 May and 4 June 1940, the retreating British Expeditionary Force, trapped along the northern coast of France, was able to evacuate over 338,000 troops to England in the Dunkirk evacuation. After the Germans invaded the Soviet Union in June 1941, Soviet leader Joseph Stalin began pressing for the creation of a second front in western Europe. In late May 1942 the Soviet Union and United States made a joint announcement that a "... full understanding was reached with regard to the urgent tasks of creating a second front in Europe in 1942." However, Churchill persuaded Roosevelt to postpone the promised invasion as, even with American help, the Allies did not have adequate forces for such a strike.

Instead of an immediate return to France, the Western Allies staged offensives in the Mediterranean Theater of Operations, where British troops were already stationed. By mid-1943, the North African Campaign had been won. The Allies then launched the invasion of Sicily in July 1943, and Italy in September 1943. By then, Soviet forces were on the offensive and had won a major victory at the Battle of Stalingrad. The decision to undertake a cross-channel invasion within the next year was taken at the Trident Conference in Washington in May 1943. Initial planning was constrained by the number of available landing craft, most of which were already committed in the Mediterranean and Pacific. At the Tehran Conference in November 1943, Roosevelt and Churchill promised Stalin that they would open the long-delayed second front in May 1944.

Four sites were considered for the landings: Brittany, the Cotentin Peninsula, Normandy, and Pas de Calais. As Brittany and Cotentin are peninsulas, it would have been possible for the Germans to cut off the Allied advance at a relatively narrow isthmus, so these sites were rejected. As the Pas de Calais is the closest point in continental Europe to Britain, the Germans considered it to be the most likely initial landing zone, so it was the most heavily fortified region. But it offered few opportunities for expansion, as the area is bounded by numerous rivers and canals, whereas landings on a broad front in Normandy would permit simultaneous threats against the port of Cherbourg, coastal ports further west in Brittany, and an overland attack towards Paris and eventually into Germany. Normandy was hence chosen as the landing site. The most serious drawback of the Normandy coastthe lack of port facilitieswould be overcome through the development of artificial Mulberry harbours. A series of specialised tanks, nicknamed Hobart's Funnies, were created to deal with conditions expected during the Normandy campaign, such as scaling sea walls and providing close support on the beach.

The Allies planned to launch the invasion on 1 May 1944. The initial draft of the plan was accepted at the Quebec Conference in August 1943. General Dwight D. Eisenhower was appointed commander of Supreme Headquarters Allied Expeditionary Force (SHAEF). General Bernard Montgomery was named as commander of the 21st Army Group, which comprised all of the land forces involved in the invasion. On 31 December 1943, Eisenhower and Montgomery first saw the plan, which proposed amphibious landings by three divisions with two more divisions in support. The two generals immediately insisted that the scale of the initial invasion be expanded to five divisions, with airborne descents by three additional divisions, to allow operations on a wider front and speed up the capture of the port at Cherbourg. The need to acquire or produce extra landing craft for the expanded operation meant that the invasion had to be delayed to June. Eventually, thirty-nine Allied divisions would be committed to the Battle of Normandy: twenty-two American, twelve British, three Canadian, one Polish, and one French, totalling over a million troops all under overall British command.

Operation Overlord was the name assigned to the establishment of a large-scale lodgement on the Continent. The first phase, the amphibious invasion and establishment of a secure foothold, was codenamed Operation Neptune. To gain the air superiority needed to ensure a successful invasion, the Allies undertook a bombing campaign (codenamed Operation Pointblank) that targeted German aircraft production, fuel supplies, and airfields. Elaborate deceptions, codenamed Operation Bodyguard, were undertaken in the months leading up to the invasion to prevent the Germans from learning the timing and location of the invasion.

The landings were to be preceded by airborne landings near Caen on the eastern flank to secure the Orne River bridges and north of Carentan on the western flank. The Americans, assigned to land at Utah Beach and Omaha Beach, were to attempt to capture Carentan and St. L the first day, then cut off the Cotentin Peninsula and eventually capture the port facilities at Cherbourg. The British at Sword Beach and Gold Beach and Canadians at Juno Beach would protect the American flank and attempt to establish airfields near Caen. A secure lodgement would be established and an attempt made to hold all territory north of the Avranches-Falaise line within the first three weeks. Montgomery envisaged a ninety-day battle, lasting until all Allied forces reached the Seine.

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