The India Office was a British government department in London established in 1858 to oversee the administration of the Provinces of India, through the British viceroy and other officials. The administered territories comprised most of the modern-day nations of the Indian Subcontinent as well as Yemen and other territories around the Indian Ocean. The India Office was headed by the Secretary of State for India, a member of the British cabinet, who was formally advised by the Council of India.

The provinces of India, earlier presidencies of British India and still earlier, presidency towns, were the administrative divisions of British governance on the Indian subcontinent. Collectively, they have been called British India. In one form or another, they existed between 1612 and 1947, conventionally divided into three historical periods:Between 1612 and 1757 the East India Company (EIC) set up "factories" in several locations, mostly in coastal India, with the consent of the Mughal emperors, Maratha Empire or local rulers. Its rivals were the merchant trading companies of Portugal, Denmark, the Netherlands, and France. By the mid-18th century three Presidency towns: Madras, Bombay and Calcutta, had grown in size. During the period of Company rule in India, 1757–1858, the Company gradually acquired sovereignty over large parts of India, now called "Presidencies". However, it also increasingly came under British government oversight, in effect sharing sovereignty with the Crown. At the same time, it gradually lost its mercantile privileges. Following the Indian Rebellion of 1857 the company's remaining powers were transferred to the Crown. Under the British Raj (1858–1947), administrative boundaries were extended to include a few other British-administered regions, such as Upper Burma. Increasingly, however, the unwieldy presidencies were broken up into "Provinces". The EIC presidency armies were restructured into the British Indian Army.