Sir William Foster CIE (19 November 1863 – 11 May 1951) was a British historiographer and civil servant who was Registrar and Superintendent of Records in the India Office. He was a member of the Hakluyt Society and was "the foremost authority on the detailed history of early British relations with India and other countries in Asia."
- The Register of Letters and of the Governor and Company of Merchants of London Trading into the East Indies 1600-1619 with Sir George Birdwood (1893)
- Letters Received By The East India Company (1897)
- The Embassy of Sir Thomas Roe to India 1615-19: As Narrated in his Journal and Correspondence 2 vols. (ed. 1899)
- The English Factories in India, 1618-1669 : a Calendar of Documents in the India Office, British Museum and Public Record Office (1911) first of thirteen volumes, eleven of which are available at: 
- A Guide to the India Office Records, 1600-1858 (1919)
- Early Travels in India, 1583-1619 (1921)
- The East India House: its History and Associations (1924)
- John Company (1926)
- A Supplementary Calendar of Documents in the India Office Relating to India or to Home Affairs of the East India Company 1600-1640 (1928)
- Thomas Herbert: Travels in Persia 1627-1629 (ed. 1928)
- A New Account of the East Indies 2 vols. with Alexander Hamilton (1930)
also - * Winter, Edward, (signed as "W. F.") in Dictionary of National Biography, London: Smith, Elder, & Co., (1885-1900) in 63 vols.
- "The British Library - India Office Select Materials - Collection details". British Library. Retrieved 3 February 2015.
- "Obituary: Sir William Foster". The Times. The Times Digital Archive. 12 May 1951. p. 8.
- "No. 33007". The London Gazette (Supplement). 30 December 1924. p. 2.
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