Sailors of the Royal Indian Navy mutiny in Bombay harbour, from where the action spreads throughout the Provinces of British India, involving 78 ships, twenty shore establishments and 20,000 sailors

The Royal Indian Navy mutiny was a failed insurrection of Indian naval ratings, soldiers, police personnel and civilians against the British government in India in February 1946. From the initial flashpoint in Bombay, the revolt spread and found support throughout British India, from Karachi to Calcutta, and ultimately came to involve over 10,000 sailors in 56 ships and shore establishments. The mutiny failed to turn into a revolution because sailors were asked to surrender after the British authorities had assembled superior forces to suppress the mutiny.

Mumbai, also known as Bombay, is the capital city of the Indian state of Maharashtra. Mumbai is the financial capital and the most populous city proper of India with an estimated population of 12.5 million (1.25 crore). Mumbai is the centre of the Mumbai Metropolitan Region, which is among the most populous metropolitan areas in the world with a population of over 23 million. Mumbai lies on the Konkan coast on the west coast of India and has a deep natural harbour. In 2008, Mumbai was named an alpha world city. Mumbai has the highest number of billionaires out of any city in Asia.

The provinces of India, earlier presidencies of British India and still earlier, presidency towns, were the administrative divisions of British governance in South Asia. 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 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".