William Grant may refer to:

• Sir William Grant (Master of the Rolls) (1752–1832), Member of the Parliament, 1790–1812; Master of the Rolls, 1801–1817
• William Grant (Northern Ireland politician) (1883–1949), Unionist M.P. for the Northern Ireland House of Commons
• William Grant (seigneur) (1744–1805), Scottish-born businessman, seigneur and political figure in Lower Canada
• William Grant, Lord Grant (1909–1972), Scottish Unionist politician and judge
• William Grant, Lord Prestongrange (1701–1764), Scottish politician and judge
• William M. Grant (1868–1931), politician in Saskatchewan, Canada

• William St Clair Grant (1894–1918), Scottish rugby player
• William Grant (footballer) (1905–1994), English footballer, played for Blackpool F.C.
• Bill Grant (Australian footballer), former Australian rules footballer

• Sir William Keir Grant (1772–1852), British Army general
• Sir William Lowther Grant (1864–1928), Royal Navy officer
• William Grant (general) (1870–1939), Australian Army colonel and temporary Brigadier General in World War I

• William Grant (businessman) (1839–1923), founder of the company William Grant & Sons, which distils Scotch whisky and other spirits
• William Grant (fur trader) (1743–1810), Scottish-born fur trader in Lower Canada
• St. William Grant (1894–1977), Jamaican trade unionist and activist
• William Grant (New Zealand) (1843–1910), New Zealand shepherd, stock dealer, landowner
• William Grant Naboré, American classical pianist
• William F. Grant (born 1924), Canadian plant geneticist, biosystematist, educator, and environmental advocate
• William Thomas Grant (1876–1972), American philanthropist and founder of the W. T. Grant stores
• William James Grant (1829–1866), English painter
• William Grant (priest), Archdeacon then Dean of Tuam
• William Grant (journalist), see Fred M. Hechinger Grand Prize for Distinguished Education Reporting
• William K. Grant, American diplomat
• William Grant (physician) (died 1786), Scottish physician

• Will Grant (born 1954), American football player
• Bill Grant (disambiguation)
• Mount William Grant, a mountain in New Zealand
• All pages with titles containing William Grant

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