Authorities of the British Raj partitioned the Bengal Presidency, separating the largely Muslim eastern areas from the largely Hindu western areas.

The British Raj was the colonial rule of the British Crown on the Indian subcontinent, lasting from 1858 to 1947. It is also called Crown rule in India, or direct rule in India. The region under British control was commonly called India in contemporaneous usage and included areas directly administered by the United Kingdom, which were collectively called British India, and areas ruled by indigenous rulers, but under British paramountcy, called the princely states. The region was sometimes called the Indian Empire, though not officially. As India, it was a founding member of the League of Nations and a founding member of the United Nations in San Francisco in 1945. India was a participating state in the Summer Olympics in 1900, 1920, 1928, 1932, and 1936.

The Partition of Bengal in 1905, also known as the First Partition of Bengal, was a territorial reorganization of the Bengal Presidency implemented by the authorities of the British Raj. The reorganization separated the largely Muslim eastern areas from the largely Hindu western areas. Announced on 16 October 1905 by Lord Curzon, then Viceroy of India, and implemented West Bengal for Hindus and East Bengal for Muslims, it was undone a mere six years later.

The Bengal Presidency, officially the Presidency of Fort William in Bengal until 1937, later the Bengal Province, was the largest of all three presidencies of British India during Company rule and later a Province of British India. At the height of its territorial jurisdiction, it covered large parts of what is now South Asia and Southeast Asia. Bengal proper covered the ethno-linguistic region of Bengal. Calcutta, the city which grew around Fort William, was the capital of the Bengal Presidency. For many years, the governor of Bengal was concurrently the governor-general of India and Calcutta was the capital of India until 1911.