The origin of the State Bank of India goes back to the first decade of the nineteenth century with the establishment of the Bank of Calcutta in Calcutta on 2 June 1806. Three years later the bank received its charter and was re-designed as the Bank of Bengal (2 January 1809). A unique institution, it was the first joint-stock bank of British India sponsored by the Government of Bengal. The Bank of Bombay (15 April 1840) and the Bank of Madras (1 July 1843) followed the Bank of Bengal. These three banks remained at the apex of modern banking in India till their amalgamation as the Imperial Bank of India on 27 January 1921.

The State Bank of India was thus born with a new sense of social purpose aided by the 480 offices comprising branches, sub offices and three Local Head Offices inherited from the Imperial Bank. The concept of banking as mere repositories of the community's savings and lenders to creditworthy parties was soon to give way to the concept of purposeful banking sub serving the growing and diversified financial needs of planned economic development. The State Bank of India was destined to act as the pacesetter in this respect and lead the Indian banking system into the exciting field of national development.