William, Willie, Will, Bill or Billy Stewart may refer to:

• 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

• 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

• 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

• 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) (c. 1910/11—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

• William Stewart (Pennsylvania politician) (1810–1876), represented 23rd congressional district from 1857 to 1861
• William M. 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

• 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

• William Stewart (footballer, born 1868), Scottish footballer who played for Preston North End and Everton in the 1890s
• Willie Stewart (1872–1945), Scottish footballer who played for Newton Heath and Luton Town
• William Stewart (footballer, born 1875), Scottish international footballer who played for Queen's Park and Newcastle United
• Billy Stewart (Australian footballer) (1884–1968), Australian rules footballer for St Kilda
• William Stewart (footballer, born 1897) (1897–1974), Scottish footballer who played for Queen's Park and Shawfield
• William Stewart (footballer, born 1910), Scottish footballer who played for Manchester United and Motherwell
• Bill Stewart (American football) (1952–2012), American football coach
• Billy Stewart (footballer, born 1965), English goalkeeper who played for several clubs, including Chester and Southport

• William Stewart (Australian cricketer) (1844–?), Australian cricketer
• William Stewart (English cricketer) (1847–1883), English cricketer
• William Stewart (cyclist) (1883–1950), British Olympic cyclist
• William Stewart (athlete) (1889–1958), Australian sprinter
• William Stewart (rower) (born 1997), British rower
• Bill Stewart (sports official) (1894–1964), American baseball coach and ice hockey referee
• Bill Stewart (high jumper) (born 1921), American high jumper and winner of the high jump at the 1941 USA Outdoor Track and Field Championships
• Bill Stewart (baseball) (1928–2013), American baseball outfielder, Kansas City Athletics
• William Payne Stewart (1957–1999), American golfer
• Bill Stewart (ice hockey) (born 1957), Canadian ice hockey defenceman

• William Stewart (makar), Scottish poet and translator active in the 1530s
• William Stewart (skipper) (fl. c. 1580-1610) was a Scottish sea captain from Dundee.
• William Robert Stewart (died 1818), American ship captain
• William W. Stewart (1776–1851), Scottish-born whaler, sealer and settler
• Sir William Drummond Stewart (1795–1871), Scottish adventurer and British military officer
• George Stewart (VC) (William George Drummond Stewart, 1831–1868), Scottish recipient of Victoria Cross; Crimean War veteran
• William Boyd Stewart (1835–1912), Canadian pastor, writer, and educator
• William Alvah Stewart (1903–1953), American federal judge
• William Stewart (skipper) (fl. c. 1580–1610) was a, Scottish sea captain
• Bill Stewart (journalist) (1941–1979), American TV correspondent for ABC News
• Bill Stewart (programmer) (1950–2009), American software creator

• William Steuart (disambiguation)
• Stewart (name)
• William Stuart (disambiguation)