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William Douglas may refer to:

Earls and Dukes of Queensberry

William Douglas, 1st Earl of Queensberry (c. 1582–1640), Scottish nobleman
William Douglas, 1st Duke of Queensberry (1637–1695), Scottish nobleman and politician, grandson of the above
William Douglas, 4th Duke of Queensberry (1724–1810), Scottish nobleman, great-grandson of the above

William Douglas, 2nd Earl of Angus (c. 1398–1437), Scottish nobleman and soldier, grandson of the 1st Earl of Douglas
William Douglas, 9th Earl of Angus (1533–1591), Scottish nobleman and supporter of Mary, Queen of Scots
William Douglas, 10th Earl of Angus (1552–1611), Scottish nobleman, son of the above
William Douglas, 1st Marquess of Douglas and 11th Earl of Angus (1589–1660), Scottish nobleman, son of the above

William Douglas, 1st Earl of Douglas (c. 1327–1384), Scottish nobleman, grandson of William le Hardi, Lord of Douglas
William Douglas, 6th Earl of Douglas (c. 1424–1440), Scottish nobleman
William Douglas, 8th Earl of Douglas (1425–1452), Scottish nobleman, cousin of the above

William Douglas, 6th Earl of Morton (c. 1540–1606), Scottish nobleman
William Douglas, 7th Earl of Morton (1582–1648), Scottish nobleman, grandson of the above

William I, Lord of Douglas (died c. 1214), medieval nobleman of Flemish origin
William Longleg, Lord of Douglas (c. 1220–c. 1274), Scoto-Norman nobleman, grandson of the above
William le Hardi, Lord of Douglas (1243–c. 1298), Scottish soldier and governor of Berwick Castle, son of the above
William IV, Lord of Douglas (died 1333), Scottish nobleman, grandson of the above

William Douglas, Lord of Liddesdale (c. 1300–1353), Scottish nobleman and soldier, cousin of the 1st Earl of Douglas
Sir William Douglas of Nithsdale (c. 1370–c. 1392), Scottish knight
Sir William Douglas of Drumlanrig (died 1427), Scottish knight, grandson of the 1st Earl of Douglas
Sir William Douglas of Glenbervie (c. 1473–1513), Scottish knight killed at the Battle of Flodden
William Douglas, 2nd Lord Mordington (1626–c. 1671), Scottish nobleman, grandson of the 10th Earl of Angus
Sir William Douglas of Kelhead (died 1673), Scottish Covenanter colonel, son of the 1st Earl of Queensberry
William Hamilton, Duke of Hamilton (born Lord William Douglas, 1634–1694), Scottish nobleman and politician, son of the 1st Marquess of Douglas
William Douglas, 14th of Cavers (c. 1688–1748), Scottish landowner and politician, MP for Roxburghshire 1715–22, 1727–34, 1742–47, and for Dumfries Burghs 1722–27
Sir William Douglas, 4th Baronet (c. 1730–1783), Scottish landowner and politician, MP for Dumfries Burghs, great-great-grandson of Sir William Douglas of Kelhead
Sir William Douglas, 1st Baronet (died 1809), Scottish mill owner, landowner and founder of Castle Douglas
Lord William Douglas (1783–1859), Scottish politician and landowner, son of Sir William Douglas, 4th Baronet

William Douglas (poet) (c. 1672–1748), Scottish writer, probable author of the poem "Annie Laurie"
William Douglas (painter, born 1780) (1780–1832), Scottish miniature and portrait painter
Sir William Fettes Douglas (1822–1881), Scottish painter
Billy Douglas (musician) (1912–1978), American jazz trumpeter and vocalist
Bill Douglas (1934–1991), Scottish film director
Bill Douglas (musician) (born 1944), Canadian composer, pianist and bassoonist
Billy Douglas (One Life to Live), fictional character on the American television series One Life to Live

William Douglas of Kirkness (1688–1747), Scottish general and politician
William Douglas (American soldier) (1742–1777), American military officer during the American Revolutionary War
Sir William Douglas (British Army officer, born 1770) (1770–1834), British Army general in the War of 1812
Sir William Douglas of Balgillo (c. 1778–1818), British Army officer during the Napoleonic Wars
William Bloomfield Douglas (1822–1906), Royal Navy officer and colonial official
Sir William Douglas (British Army officer, born 1858) (1858–1920), British Army general in the First World War
Sholto Douglas, 1st Baron Douglas of Kirtleside (William Sholto Douglas, 1893–1969), Marshal of the Royal Air Force

William Lewis Douglas (1845–1924), governor of Massachusetts, 1905–1906
William Douglas (Canadian politician), member of the Legislative Assembly of New Brunswick, 1886–1892
William H. Douglas (1853–1944), U.S. Representative from New York
Billy Douglas (politician) (fl. 1918–1963), unionist activist from Northern Ireland
William Douglas (Northern Ireland politician, born 1923) (1923–2013), Orangeman and Assembly member

William Douglas (cricketer, born 1848) (1848–1887), New Zealand cricketer
Billy Douglas (rugby union) (1863–1943), Welsh rugby union player
William Douglas (footballer, fl. 1890s), Scottish footballer for Newton Heath and Blackpool
William Douglas (footballer, born 1890) (1890–1917), Scottish footballer for Queen's Park
Bill Douglas (rugby union) (born c. 1898), Australian rugby union player
William Douglas (cricketer, born 1903) (1903–1981), New Zealand cricketer
William J. Douglas (footballer), Scottish footballer for Montrose, Brechin City, Blackburn Rovers, Dick, Kerr's XI and Rochdale in the 1930s
William Douglas (boxer) (1940–1999), American boxer

William Douglas (sea captain) (died 1791), Scottish and American maritime fur trader
William Douglas (priest) (died 1819), Church of England priest, Archdeacon of Wilts, 1799–1804
William Douglas (advocate) (c. 1784–1821), Scottish advocate and Member of Parliament for Plympton Erle, 1812–1816
William O. Douglas, American who in 1878 received a patent for a lenticular truss bridge