The Eighth Army was a field army of the British Army during the Second World War. It was formed as the Western Army on 10 September 1941, in Egypt, before being renamed the Army of the Nile and then the Eighth Army on 26 September. It was created to better control the growing Allied force based in Egypt and to direct its efforts to lift the siege of Tobruk via Operation Crusader.
It later directed Allied forces through the remaining engagements of the Western Desert campaign, oversaw part of the Allied effort during the Tunisian campaign and finally led troops throughout the Italian campaign.