Bombay Harbour in the context of Thana Creek

The State of India, also known as the Portuguese State of India or Portuguese India, was a state of the Portuguese Empire founded seven years after the discovery of the sea route to the Indian subcontinent by Vasco da Gama, a subject of the Kingdom of Portugal. The capital of Portuguese India served as the governing centre of a string of military forts and maritime ports scattered along the coasts of the Indian Ocean.

Francisco de Almeida, the first viceroy, established his base of operations at Fort Manuel in the Malabar region, after the Kingdom of Cochin negotiated to become a protectorate of Portugal in 1505. With the Portuguese conquest of Goa from the Bijapur Sultanate in 1510, Goa became the major anchorage for the Armadas arriving in India. The capital of the viceroyalty was transferred from Cochin to Goa in 1530. From 1535, Mumbai (Bombay) was a harbour of Portuguese India, known as Bom Bahia, until it was handed over to Charles II of England in 1661 as part of the dowry of Catherine de Braganza. The expression "State of India" began regularly appearing in documents in the mid-16th century.

The Bombay Presidency, officially called the Presidency of Bombay until 1937, later the Bombay Province, also called Bombay and Sind (1843–1936), was an administrative subdivision (province) of British India, with its capital in the city that came up over the seven islands of Bombay. The first mainland territory was acquired in the Konkan region with the Treaty of Bassein. Poona was the summer capital.

The Bombay Province has its beginnings in the city of Bombay that was leased in fee tail to the East India Company, via the Royal Charter of 27 March 1668 by King Charles II of England, who had in turn acquired Bombay on 11 May 1661, through the dowry by way of his marriage treaty with princess Catherine De Braganza, daughter of John IV of Portugal. The English East India Company transferred its Western India headquarters from Surat in the Gulf of Cambay after it was sacked, to the relatively safe Bombay Harbour in 1687. The province was brought under direct rule along with other parts of British India through Pitt's India Act, after the nationalisation of the East India Company. Major territorial acquisitions were made by the company after Anglo-Maratha Wars when the whole of the Peshwa's dominions and much of the Gaekwad's sphere of influence were annexed to the Bombay Presidency in stages up until 1818. Aden including Socotra were placed under Bombay in 1839, Sind was annexed by the company in 1843 after defeating the Talpur dynasty in the Battle of Hyderabad.