William, Willie, Will, Bill or Billy Stewart may refer to:
Entertainment
Jack Williamson or Will Stewart (1908–2006), American science fiction writer
William G. Stewart (1933–2017), English television producer, director and presenter of Fifteen to One Billy Stewart (1937–1970), American R&B singer and pianist Bill Stewart (actor) (1942–2006), English actor best known as Sandy Longford on A Touch of Frost Bill Stewart (musician) (born 1966), American jazz drummer
Public officials
Australia and New Zealand
William Stewart (governor) (1769–1854), Lieutenant Governor of New South Wales
William James Stewart (businessman) (1855–1924), businessman and mayor of Northam, Western Australia William Downie Stewart Sr (1842–1898), member of House of Representatives for City of Dunedin and Dunedin West William Downie Stewart Jr (1878–1949), historian; mayor of Dunedin; son of William Downie Stewart Sr. William Stewart (New Zealand politician) (1861–1955), Reform Party member of House of Representatives
Canada
William Stewart (Canada West) (1803–1856), Canadian businessman and political figure William J. Stewart (hydrographic surveyor) (1863–1925), Canada's first chief hydrographic surveyor William S. Stewart (1855–1938), lawyer, judge and political figure on Prince Edward Island William Atcheson Stewart (1915–1990), member of Legislative Assembly of Ontario William Douglas Stewart (1938-2018), member of House of Commons William Dunbar Stewart (1839–?), merchant and political figure on Prince Edward Island William James Stewart (1889–1969), mayor of Toronto William Stewart (Ontario politician), leader of the Communist party in Ontario in the 1970s
United Kingdom and Ireland
William Stewart (bishop of Aberdeen) (c. 1490–1545), Scottish clergyman and diplomat William Stewart (makar) (c.1476–c.1548), Scottish poet William Stewart (Lord Mayor of London), lord mayor of London William Stewart (Belfast South MP) (1868–1946), Northern Ireland member of Parliament of the United Kingdom William Stewart (Houghton-le-Spring MP) (1878–1960), English member of Parliament William Stewart (ILP politician) (1856–1947), Secretary of the Scottish Divisional Council of the Independent Labour Party William Stewart (Northern Ireland senator) (—1979), member of the Senate of Northern Ireland William Stewart (politician, died 1748) (c. 1706–1748), Scottish member of Parliament of Great Britain William Stewart (MP for Kirkcudbright) (1737–1797), Scottish member of Parliament of Great Britain Sir William Stewart (British Army officer, born 1774) (1774–1827), Scottish member of Parliament of Great Britain Sir William Stewart (soldier) (1643–1726), Scots-Irish soldier William Stewart, 1st Earl of Blessington (1709–1769), Anglo-Irish peer and member of the House of Lords William Stewart, 2nd Viscount Mountjoy (1675–1728), Anglo-Irish peer Will Stewart (bishop) (1943–1998), Bishop of Taunton Sir William Houston Stewart (1822–1901), Scottish naval officer Sir William Stewart of Baldorran (c.1440–c.1500), Scottish landowner William Stewart of Caverston, Scottish soldier, captain of Dumbarton Castle William Stewart of Grandtully (1567–1646), Scottish landowner and courtier Sir William Stewart of Houston (1540–1605), Scottish soldier, privy councilor and diplomat William Stewart of Monkton (d. 1588), Scottish landowner William Stewart (courtier), Scottish servant to James VI William Stewart, Lord Allanbridge (1925–2012), Scottish judge William Stewart, 1st Viscount Mountjoy (1653–1692), Anglo-Irish peer and soldier
United States
William Stewart (Pennsylvania politician) (1810–1876), represented 23rd congressional district from 1857 to 1861 William Morris Stewart (1827–1909), one of Nevada's first two U.S. senators William Thomas Stewart (1853–1935), Utah territorial legislature William R. Stewart (1864–1958), second African-American elected to Ohio Senate William J. Stewart (Pennsylvania politician) (1950–2016), Pennsylvania politician
Science
William Alexander Stewart (1930–2002), American sociolinguist
William Kilpatrick Stewart (1913–1967), Scottish researcher in aerospace physiology William H. Stewart (1921–2008), pediatrician and epidemiologist, 10th surgeon general of the United States Sir William Stewart (biologist) (born 1935), Scottish microbiologist