The German occupation of Luxembourg in World War II began in May 1940 after the Grand Duchy of Luxembourg was invaded by Nazi Germany. Although Luxembourg was officially neutral, it was situated at a strategic point at the end of the French Maginot Line. On 10 May 1940, the German Wehrmacht invaded Luxembourg, Belgium and the Netherlands. Luxembourg was initially placed under a military administration, but later became a civilly administrated territory and finally was annexed directly into Germany. The Germans believed Luxembourg to be a Germanic state, and attempted to suppress what they perceived as alien French language and cultural influences. Although some Luxembourgers joined the resistance or collaborated with the Germans, both constituted a minority of the population. As German nationals, from 1942, many Luxembourgers were conscripted into the German military. Nearly 3,500 Luxembourgish Jews were murdered during the Holocaust. The liberation of the country by the Allies began in September 1944, but due to the Ardennes Offensive it was not completed until early 1945.

The German invasion of Luxembourg was part of Case Yellow, the German invasion of the Low Countries—Belgium, Luxembourg and the Netherlands—and France during World War II. The battle began on 10 May 1940 and lasted just one day. Facing only light resistance, German troops quickly occupied Luxembourg. The Luxembourgish government, and Grand Duchess Charlotte, managed to escape the country and a government-in-exile was created in London.