The 4th Indian Infantry Division, also known as the Red Eagle Division, is an infantry division of the Indian Army. This division of the British Indian Army was formed in Egypt in 1939 during the Second World War. During the Second World War, it took part in campaigns in East Africa, Syria, North Africa and Italy. Post independence, the division is part of the I Corps and headquartered at Prayagraj.

The Indian Army during British rule, also referred to as the British Indian Army, was the main military force of the British Indian Empire until 1947. It was responsible for the defence of both British India and the princely states, which could also have their own armies. As quoted in the Imperial Gazetteer of India, "The British Government has undertaken to protect the dominions of the Native princes from invasion and even from rebellion within: its army is organized for the defence not merely of British India, but of all possessions under the suzerainty of the King-Emperor." The Indian Army was an important part of the forces of the British Empire, in India and abroad, particularly during the First World War and the Second World War.