William Fraser may refer to:

• William W. Fraser (1844–1915), American Civil War soldier and Medal of Honor recipient
• William Archibald Kenneth Fraser (1886–1969), British army officer
• William Fraser (British Army officer) (1890–1964), British army officer
• William M. Fraser III (born 1952), United States Air Force general

• William Fraser, of Fraserfield (1691–1727), Scottish landowner and politician, MP for Elgin Burghs 1722–25
• William Fraser (Clerk of the Signet) (died 1802), British politician, Clerk of the Signet and an Undersecretary of State
• Sir William Fraser, 4th Baronet (1826–1898), English politician
• William Fraser (New Zealand politician, born 1827) (1827–1901)
• William Fraser (Canadian politician) (1832–1909), member of the Legislative Assembly of Northwest Territories, 1872–1875
• William Fraser (New Zealand politician, born 1840) (1840–1923)
• William Alexander Fraser (politician) (1886–1962), Canadian politician
• Ian Fraser, Baron Fraser of Lonsdale or William Jocelyn Ian Fraser (1897–1974), British politician and chairman of St Dunstan's

• William Lovat Fraser (1884–1968), Scottish cricketer and rugby union player
• Willie Fraser (footballer) (1929–1996), Australian footballer who played for A.F.C. Sunderland
• Willie Fraser (born 1964), baseball player
• William Fraser (rugby union) (born 1989), Saracens F.C. Academy Player

• William Alexander Fraser (writer) (1859–1933), Canadian writer
• William Fraser (bishop of St Andrews) (died 1297), Bishop of St Andrews, Guardian of Scotland
• William Fraser, 12th Lord Saltoun (1654–1715), Scottish peer and the 11th Laird of Philorth
• William Fraser (British administrator), working in Madras, India, 1709–1711
• William Fraser (bishop of Arichat) (1779–1851), Canadian Roman Catholic bishop
• William Fraser (British India civil servant) (1784–1835)
• William Fraser (historian) (1816–1898), professor of Scottish history
• William Smith Fraser (1852–1897), American architect
• William Fraser (architect) (1867–1922), Scottish architect
• William Mackenzie Fraser (1878–1960), New Zealand labourer, civil engineer and ethnological collector
• William Fraser, 1st Baron Strathalmond (1888–1970), Scottish businessman and chairman of the Anglo-Iranian Oil Company
• William Kerr Fraser (1929–2018), British civil servant and University of Glasgow vice-chancellor
• William Fraser, 3rd Baron Strathalmond (born 1947), Scottish peer

• Bill Fraser (disambiguation)
• William Frazer (disambiguation)