The British Fourteenth Army was a multinational force comprising units from Commonwealth countries during World War II. Many of its units were from the Indian Army as well as British units and there were also significant contributions from West and East African divisions within the British Army.

It was often referred to as the "Forgotten Army" because its operations in the Burma Campaign were overlooked by the contemporary press, and remained more obscure than those of the corresponding formations in Europe for long after the war.

For most of the Army's existence, it was commanded by Lieutenant-General William Slim.

The Fourteenth Army, like the Eighth Army, was made up from units that came from all corners of the Commonwealth. In 1945 the Fourteenth Army was the largest army in the Commonwealth and the largest army in the world, with about half a million men under command. Three African divisions, the 81st, 82nd West African Division and 11th East African Division were attached to the army. There were many units and formations from the British Army but the majority of the army was built around the British Indian Army, which was stated to be the largest all-volunteer army in history with 2,500,000 men.

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