Operation Crusader was a military operation of the Western Desert Campaign during the Second World War by the British Eighth Army against the Axis forces in North Africa commanded by Generalleutnant (Lieutenant-General) Erwin Rommel. The operation was intended to bypass Axis defences on the Egyptian–Libyan frontier, defeat the Axis armoured forces near Tobruk, raise the Siege of Tobruk and re-occupy Cyrenaica.

The Western Desert campaign took place in the deserts of Egypt and Libya and was the main theatre in the North African campaign of the Second World War. Military operations began in June 1940 with the Italian declaration of war and the Italian invasion of Egypt from Libya in September. Operation Compass, a five-day raid by the British in December 1940, was so successful that it led to the destruction of the Italian 10th Army over the following two months. Benito Mussolini sought help from Adolf Hitler, who sent a small German force to Tripoli under Directive 22. The Afrika Korps was formally under Italian command, as Italy was the main Axis power in the Mediterranean and North Africa.